Evidence sort and false results
Open your materials, follow the steps, then turn in your work.
Sort case evidence by strength and explain how false positives and false negatives change a decision.
1. Open your materials
Use the materials named in the first step below. Open lesson resources.
2. Start the work
Sort the case test results into strong, moderate, and weak evidence with a one-word reason each.
Show all 5 required steps
- Sort the case test results into strong, moderate, and weak evidence with a one-word reason each.
- Identify one result that could be a false positive and one that could be a false negative.
- Explain in one sentence how each false result would change the patient's treatment.
- Decide which result you trust most and why.
- Submit your evidence sort and false-result analysis as your daily evidence.
Lost your place? Lost your place? You need your three-column sort: strong, moderate, weak, with a one-word reason on each. Have that, and go to the false-positive and false-negative pair.
Check your work before submitting
- You'll be able to rank evidence by strength.
- You'll be able to explain the consequence of a false positive or false negative.
Before lab work: read the safety rules
- Wear the required PPE, keep the bench clear, handle equipment only as directed, and know where the eyewash, sink, and spill kit are before you start.
- Human samples and data stay private: label with a code, never a name, and dispose of materials in the correct waste container, then wash your hands.
3. Turn in your work
DueCheck Schoology- Hand in
- Evidence sort table (strong/moderate/weak with one-word reasons) plus two false-result sentences and a justification for the most trusted result.
How to submit and name your file
Use the submission route shown on today's page.
In Schoology, open your course and the assignment for this lesson. Attach your file, select Submit, and check that it appears in the submission.
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How this lesson connects
Keep using what you learned last class: Early screening lowers cost and mortality, so a test that only wealthy or well-insured patients can reach turns a medical advance into a driver of inequality. Today: The cost of a wrong result depends on the decision it feeds, so the same error rate is acceptable for screening and unacceptable for a surgical decision.
Optional: listen or watch a unit review▸
Need help? Warm-up, timing, and directions▸
💡 Big idea: The cost of a wrong result depends on the decision it feeds, so the same error rate is acceptable for screening and unacceptable for a surgical decision.
- 0-8Hook class vote; define and with genetic test examples
- 8-25Sort all case test results into strong, moderate, weak with one-word reason each
- 25-45Identify one candidate and one candidate from the sort
- 45-60Write one sentence per error type on how it would change the treatment decision
- 60-72State which result you trust most and justify; partner check logic
- 72-80Submit evidence sort and false-result analysis to the class site
- • Hook: Ask: which error is worse for a screening test, a or a ? Take a class vote and note the reasoning.
- • Why it matters: The sorting skill is used in clinical decision support, evidence-based medicine, and WebXam 072130 Biotech Research questions.
- • Today's work: You rank all case evidence by strength and then model how two error types propagate into treatment decisions.
- • Exit goal: Evidence sort and false-result analysis submitted before the bell.
- • A says disease is present when it is not; in genetic medicine it may lead to unnecessary preventive surgery or anxiety.
- • A says disease is absent when it is present; it may delay treatment until the disease progresses.
- • Evidence strength depends on sensitivity, specificity, and reproducibility; a single positive SNP with low sensitivity is weak evidence alone.
PLTW connection and today's work
Open Activity 2.2.2 Reproductive Technology in myPLTW and sort the case test results by strength.
Today's stopping point: Annotated case packet should be done (Tuesday); evidence sort and false-result analysis due today.
PLTW activity titles identify the course connection. If your account will not open, use the posted materials for today and tell Mr. Mendoza. Do not mark an online activity complete unless you completed it.
Course connection
- Activity 2.2.2 Reproductive Technology
The mapping has not been confirmed inside myPLTW.
Use the turn-in directions at the top of this page. Do not create a second submission unless your teacher asks for one.
Show another explanation or a smaller first step
Need help? Choose a starting point
Finish the assigned lab safely before starting extra practice.
Lesson resources: reading, slides, and vocabulary▸
The deck carries the prior idea forward, lets you inspect an analogy, maps the rule to biology, and ends with the same evidence decision and exit ticket used on this page.
Generated from this lesson's canonical data with a red-team citation check.
Early screening lowers cost and mortality, so a test that only wealthy or well-insured patients can reach turns a medical advance into a driver of inequality.
The cost of a wrong result depends on the decision it feeds, so the same error rate is acceptable for screening and unacceptable for a surgical decision.
A research team lays out its question, variables, controls, sampling plan, measurement record, and analysis before deciding what the data support.
- Which variable is changed or compared?
- Which conditions and measurements must stay consistent?
- Which conclusion is inside the study's evidence boundary?
Define variables, controls, sampling, units, and the analysis plan before interpreting a result; analysis cannot repair biased or inconsistent measurement.
A well-organized classroom study can still be limited by , measurement quality, confounding, and the population represented.
- • Question and variable cards map to the study design.
- • Control and measurement cards map to fair, reproducible data collection.
- • The conclusion card maps to a bounded claim supported by the analysis.
Driving question: Your case file has results of uneven quality. Which ones would you let a surgeon act on?
What you already know: Early screening lowers cost and mortality, so a test that only wealthy or well-insured patients can reach turns a medical advance into a driver of inequality.
New idea: The cost of a wrong result depends on the decision it feeds, so the same error rate is acceptable for screening and unacceptable for a surgical decision.
Visual or model: F1. F1. A lesson illustration or teaching diagram for Evidence sort and false results. Use it with E1-E3; it is a model or context image, not experimental or patient data. What to notice: Trace the labeled testing, treatment, or biological process and identify where evidence limits the decision.
- Observe or measure the relevant feature in today's lesson.
- Organize the observation with a stable evidence ID.
- Apply this rule: Define variables, controls, sampling, units, and the analysis plan before interpreting a result; analysis cannot repair biased or inconsistent measurement.
- Choose the option the evidence supports and state the limit of the conclusion.
Real biomedical example: Your case file has results of uneven quality. Which ones would you let a surgeon act on?
What the evidence supports: E1-E3 and F1 support the daily take-home when the response meets the stated success criteria.
What it cannot prove: The package does not support claims beyond this lesson's or any real patient diagnosis.
- • : Identifying a disease by detecting specific DNA, RNA, or proteins in a sample, allowing precise diagnosis at the level of genes and molecules.
- • validity: How well a test or study actually measures what it claims to, so the conclusions truly reflect reality.
- • reliability: The degree to which a measurement, method, or person produces the same dependable result each time under the same conditions.
- • : A test result that signals a condition is present when it actually is not, a kind of error that can lead to needless worry or treatment.
- • : A test result that says a condition is absent when it is actually present, missing a true case.
- • : An organized roadmap of the steps, therapies, and goals a healthcare team will follow to manage or cure a patient's condition.
Use it now: Choose one decision option. Cite E1 and E3, then explain how the rule connects the evidence to your choice.
Go further, optional: The source links below are optional enrichment. Every fact required for today's local evidence decision appears in this lesson package.
An uses selective binding and controls to produce a measurable signal, but performance, cross-reactivity, sampling, and the decision threshold limit what a result can establish.
Limit: A classroom result does not establish a clinical diagnosis or an exact target concentration unless the validated and support that use.
Define variables, controls, sampling, units, and the analysis plan before interpreting a result; analysis cannot repair biased or inconsistent measurement.
Limit: A well-organized classroom study can still be limited by , measurement quality, confounding, and the population represented.
You can rank evidence by strength.
Limit: E3 defines the classroom product or success criterion. It is not independent scientific evidence and cannot justify a clinical or causal claim.
PLTW-GEND-2026-11-10 · Simulated classroom evidence scenario
Your role: medical interventions team member
Decision: Your team must decide what the evidence from today's lesson supports before submitting the labeled and result claim named on today's page.
- • Stop short of a diagnosis, because the classroom lacks the validated and that claim needs.
- • Rank each piece by its source and controls, then say how a or negative changes the plan.
- • Trust the clearest, most polished write-up, since a well-explained result reads like the strongest evidence.
Response: State one choice, cite at least two evidence IDs, explain the rule that connects them, and add one limitation. Submit it as the labeled and result claim.
Claim ceiling: Today's evidence supports a classroom claim about today's lesson. It cannot prove causation, diagnose a real patient, or justify action outside this room.
Reason for review: Your team must decide what the evidence from today's lesson supports before submitting the labeled and result claim named on today's page.
Context: False positives and false negatives cause different harms to different people, so the acceptable error rate depends on what the result will be used to do, not on the test alone.
- • T1: Sort the case test results into strong, moderate, and weak evidence with a one-word reason each.
- • T2: Identify one result that could be a and one that could be a .
- • T3: Explain in one sentence how each false result would change the patient's treatment.
- • T4: Decide which result you trust most and why.
- • T5: Submit your evidence sort and false-result analysis as your daily evidence.
- • E1: An uses selective binding and controls to produce a measurable signal, but performance, cross-reactivity, sampling, and the decision threshold limit what a result can establish.
- • E2: Define variables, controls, sampling, units, and the analysis plan before interpreting a result; analysis cannot repair biased or inconsistent measurement.
- • E3: You can rank evidence by strength.
Measurements: Use only the measurements, units, graph, or counts supplied in today's task. No additional patient measurement is implied.
Figure finding: Teaching diagram for Evidence sort and false results. Trace the labeled testing, treatment, or biological process and identify where evidence limits the decision. This is a teaching model, not patient or experimental data.
Uncertainty: This is a composite classroom scenario. Missing history, measurements, or confirmation tests remain unknown and limit the conclusion.
Mean = sum of values / number of values. Median = middle ordered value. Range = maximum - minimum.
For 2, 4, 4, and 10: mean = 20 / 4 = 5, median = 4, and range = 10 - 2 = 8.
Mean, median, and range keep the measurement unit. Order the values before finding the median.
Calculate the requested summary for today's supplied values, then write what it reveals and what it hides.
- • The solution must address the stated need in today's lesson.
- • The decision must be supported by E1-E3.
- • The final product must make the success criteria visible.
- • Complete the work inside the 80-minute block.
- • Use only supplied or teacher-approved materials and evidence.
- • Do not trade , accessibility, or privacy for speed.
- • and evidence quality: must pass before scoring other criteria.
- • User need and effectiveness: highest scored criterion.
- • Time, cost, and ease of use: compare only after and effectiveness pass.
Test evidence: For each option, record the E1-E3 result that supports or fails each criterion. Do not assign a score without a named observation.
- Version or option tested
- Criterion met or missed
- Evidence ID and result
- Revision made
- Reason for the revision
- Need and user
- Criteria and constraints
- Chosen option and evidence
- Test result
- Revision and reason
Students often think Students rank evidence by how alarming it sounds rather than by how reliable it is.. The trap: A dramatic result from a low-sensitivity test is weak evidence, and a dull result from a well-validated one can be strong. Strength comes from sensitivity, specificity and reproducibility, not from how serious the named condition is.
Parallel case, not today's case: a 9 year old arrives with a sore throat and fever. The clinic runs a rapid antigen test for group A streptococcus, sends a throat culture, and takes a history.
Result | Strength | One-word reason
Throat culture positive at 24 hours | Strong | Confirmatory
Rapid antigen test, positive | Strong | Specific
Rapid antigen test, negative | Moderate | Insensitive
Fever reported at home, no thermometer | Weak | Unmeasured
Sibling said to have had strep, undocumented | Weak | Hearsay
One result that could be a false positive: the rapid antigen test. It detects strep antigen, and a child who carries strep in the throat without being ill from it can test positive while a virus is causing today's sore throat.
How that would change the patient's treatment: the child takes antibiotics they do not need, carrying the side effects and the resistance cost, and the actual viral cause stops being investigated.
One result that could be a false negative: the rapid antigen test again, failing in the other direction. It is meaningfully less sensitive than culture, which is why a negative rapid test in a child is normally backed up by a culture rather than believed on its own.
How that would change the patient's treatment: untreated group A strep is the case that can go on to rheumatic fever, so a false negative nobody backs up is the more costly of the two errors here.
The result I trust most: the 24 hour culture. It grows the organism itself instead of detecting a fragment of it, and it is the reference standard the rapid test is measured against.
How to use this: today's case is not this one. Sort your own results with the same three questions. What does this test actually detect, which direction can it fail in, and what does the patient lose when it does?
This model shows the level of evidence and organization needed to complete: Completes the evidence-sort task on a DIFFERENT case from today's, so it models the ranking and the false-result reasoning without handing over the sort students must do: every result ranked with a one-word reason, one plausible false positive and one false negative, the treatment consequence of each, and the result the student trusts most.
- Name the variables and include units.
- Enter observations without changing the raw values.
- Check labels, calculations, and patterns before interpreting the data.
Keep the structure. Replace the question, facts, measurements, and evidence. Then recheck units, vocabulary, and whether the conclusion goes beyond the evidence.
Also due today: Submit the evidence sort table and both false-result sentences on Schoology by end of period.
- CER:
- Claim, Evidence, Reasoning: make a claim, back it with evidence, explain your reasoning.
- SOP:
- Standard Operating Procedure, the exact steps to follow (especially in a lab).
- Tracker:
- Your PLTW progress log where you record completed evidence.
- myPLTW:
- The PLTW course site where you do the online activities. Find it in Clever with your Microsoft sign-in, right next to Schoology.
Tap the speaker to hear a term. Add two of these to your notebook glossary with a definition and an example in your own words.
Pick just 2 or 3 words from today and make them yours: write what each one means in your own words, name the context clue or evidence that helped, then give one example from what you actually did in Evidence sort and false results. Try your own words first; the glossary is there if you get stuck. This is voluntary and counts as extra credit, so keep it short.
Saved on this device. Show Mr. Mendoza or add these to your notebook glossary to claim the extra credit.
Classroom documents for this lesson are posted in Schoology. Open Clever, then Schoology, and find each one by the name shown on its card.
Use this if you were absent, got stuck, or need another pass before you submit the lesson artifact.
Placement rationale
Matched Unit 2 synthesis and by path:Medical-Interventions/Unit-2_How-to-Screen-Your-Genes; keywords:genetic counseling, screening, testing. Score 154. Visibility: student-schoology (student-facing resource; link through Schoology rather than local path).
Use this after the required lesson work when you are ready for a harder application or a deeper connection.
Placement rationale
Matched Unit 2 synthesis and by path:Medical-Interventions/Unit-2_How-to-Screen-Your-Genes; keywords:genetic counseling, screening, testing. Score 146. Visibility: student-schoology (student-facing resource; link through Schoology rather than local path).
Use this after the required lesson work when you are ready for a harder application or a deeper connection.
Placement rationale
Matched Unit 2 synthesis and by path:Medical-Interventions/Unit-2_How-to-Screen-Your-Genes; keywords:genetic counseling, screening, testing. Score 142. Visibility: student-schoology (student-facing resource; link through Schoology rather than local path).
Sign in to Clever with your district Microsoft account to open Schoology or myPLTW. Follow today's posted steps. If myPLTW will not open, use the posted alternative and tell Mr. Mendoza. Turn in your completed work through the Schoology assignment.
Practice: try a question, then check your answer▸
Claim ceiling for this check: Today's evidence supports a classroom claim about today's lesson. It cannot prove causation, diagnose a real patient, or justify action outside this room.
A screening test has high sensitivity and low specificity. Which error does it make more of, and why might that still be the right test to use first?
Write an answer and pick a confidence to unlock the key.
Fast retrieval with instant answers, not the commit-then-reveal check above. Try each from memory first: write what you remember about the earlier units, then check yourself here.
Missed class or ready for more?▸
Run this before you touch the bench. It is built from the real lab procedure, so the decisions you make here are the ones you will make with the equipment in your hands.
I can name the procedure's purpose and the evidence I will record. I can state today's specific hazards and the control for each. If this deck does not name them, I ask Mr. Mendoza before I touch anything. My data table is ready before materials are handled.
Finish the checklist before you handle any material.
- • Wear the required PPE, keep the bench clear, handle equipment only as directed, and know where the eyewash, sink, and spill kit are before you start.
- • Human samples and data stay private: label with a code, never a name, and dispose of materials in the correct waste container, then wash your hands.
- 1Before materials are handled, identify the purpose, variables or comparison, controls, measurement units, and stop-work condition.
- 2Sort the case test results into strong, moderate, and weak evidence with a one-word reason each.
- 3Identify one result that could be a false positive and one that could be a false negative.
- 4Explain in one sentence how each false result would change the patient's treatment.
- 5Decide which result you trust most and why.
- 6Submit your evidence sort and false-result analysis as your daily evidence.
- 7Record each result in the prepared table before interpreting it. Mark missing, repeated, or invalid results truthfully.
- 8Complete the named cleanup and waste route, remove PPE safely, wash hands when required, and confirm the station is ready for the next group.
| Trial or sample ID | Independent condition | Measured result with units | Observation before interpretation | Quality-control note |
|---|---|---|---|---|
Before the procedure, predict the result and cite the rule behind the prediction.
After the procedure, compare the result with the prediction and name one limitation or source of uncertainty.
What today's skills lead to. These are real health-science careers this course builds toward. Tap one to see, on the US Department of Labor's O*NET site, what the job actually involves, what it pays, and how fast it is growing.
Today is individual work you can do from home: complete the same target above, then submit your Data table.
Go to Schoology to turn this in. Submit one PDF. Put your first and last name in the document header. Name the file: FirstName LastName - Assignment Title - YYYY-MM-DD.pdf. If you cannot get in, see Mr. Mendoza. Do not skip the work.
Class still runs. Complete the online activity above (it's self-guided). Need the concept taught without a teacher? Use this authoritative explainer:
MedlinePlus: How is genetic testing done and what do results mean?You've passed Unit 2, so the optional extra-credit track is open. Complete reserved-unit work from home, including virtual labs, for extra credit. Each item shows its correct submission route.
Open the extra-credit track- CompleteEvery required part of the artifact is present, nothing left blank.
- AccurateThe science and the data are correct and match the evidence.
- Scientific reasoningYou explain your claim with evidence and reasoning (CER), not just an answer.
- Professional communicationClear, organized, labeled, and written the way a clinician or scientist would.
- SubmittedGo to Schoology to turn this in. Submit one PDF. Put your first and last name in the document header. Name the file: FirstName LastName - Assignment Title - YYYY-MM-DD.pdf. If you cannot get in, see Mr. Mendoza. Do not skip the work.
- Error analysis and method · counts doubleName a specific limit of the method and how it moved your result, and compare what you predicted to what happened. "Human error" does not count; say what about the procedure or instrument caused it.
This week
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