Ethics of conclusions
Open your materials, follow the steps, then turn in your work.
Debate how much evidence is enough to name a cause of death, and defend your threshold.
1. Open your materials
2. Start the work
Read the prompt: When is the evidence strong enough to conclude?
Show all 5 required steps
- Read the prompt: When is the evidence strong enough to conclude?
- List one risk of concluding too early and one of never concluding.
- Choose a side: high certainty required vs. reasonable certainty suffices.
- Argue your claim in your group, referencing convergent evidence.
- Post a written CER stating your evidence threshold and reasoning.
Lost your place? Lost your place? You should have written down one risk of concluding too early and one of never concluding (step 2). If you have those two risks, pick your side (high certainty vs. reasonable certainty) and start your CER; if not, reread the prompt in step 1 first.
Check your work before submitting
- I can articulate a standard for sufficient evidence.
- I can defend a position with reasoning.
3. Turn in your work
DueCheck Schoology- Hand in
- Written CER (3-5 sentences) arguing what evidence threshold justifies a cause-of-death conclusion, referencing convergent evidence and at least one risk on either side.
How to submit and name your file
Post your CER to the discussion board or hand in the written copy before leaving.
In Schoology, open your course and the assignment for this lesson. Attach your file, select Submit, and check that it appears in the submission.
PDF upload helpYou get two school days for every day you were absent, so this deadline moves with you.
Find this lesson's Schoology assignments
These are existing assignments for your section. Follow the directions in the assignment you are working on; this list does not add new work. Check Schoology for each deadline.
Link will not open? Open Schoology, choose your course and section, and find the title shown above.
How this lesson connects
Keep using what you learned last class: Should we ban antibiotic use in livestock? Today: Forensic and biomedical conclusions demand a threshold of convergent evidence, several independent tests that agree, because any single finding can be wrong and a wrong cause of death carries real human cost.
Case background, evidence, and file details▸
How today connects to the case
Where: Statik Sound, a neighborhood recording studio. Who: Marcus Bell, 34, owner and producer of Statik Sound, found on the studio floor behind the mixing console on a Monday morning by his business partner.
The scene in our room is the scene in the case: tape at the door, the outline and torso behind the console, the lower body beneath a fallen speaker cabinet and an acoustic moving blanket. Responders left the scene as found, pending investigation.
Your job: By Day 18 your team names the manner and cause of death and backs each one with at least four exhibits across three different evidence types. Every claim stops where the evidence stops.
Today you will study how a real-style wrongful conviction happens, name the reasoning failures that build one, and set the claim ceiling for your own case report.
Remember: The most dangerous evidence is the kind that makes you stop looking. Tunnel vision is a process failure, and process failures have process fixes.
- Project 1.2.6 Case Closed
This John Hay case practices skills connected to the PLTW activity above. Follow today's directions for the assigned work.
Missed class? Open today's worksheet and briefing. Use simulated data only if the worksheet or Mr. Mendoza provides it, and label it "Simulated data." If a required measurement or file is missing, ask Mr. Mendoza. Do not invent results.
Evidence released today
No new exhibits today. Work with what the case file already holds.
Exhibit means one numbered piece of evidence. Thread means the team lane it belongs to (Scene, Trace, Serology and DNA, Toxicology, Medical Examiner, Records). Exhibits are handed out on paper in class on the day they are released, and the same files are attached to that day's Schoology assignment.
Notebook reminders
- Investigation Day 15 pack (paper in class; the PDF is above and on the Schoology assignment)
- Investigative Notebook: Day 15 Cornell page
- Investigative Notebook: Claim-ceiling card (inside back cover): personalize it today
Written CER (3-5 sentences) arguing what evidence threshold justifies a cause-of-death conclusion, referencing convergent evidence and at least one risk on either side.
Post your CER to the discussion board or hand in the written copy before leaving.
Schoology assignment: Wk6 D15 · Where Claims Must Stop (PLTW 1.2.6)
What the evidence can and cannot prove
- Classroom evidence supports a classroom finding. It cannot convict a real person or diagnose a real patient.
- A hair consistent with a person proves a hair like theirs was present, not that the person was, and never when.
- A fingerprint proves touch, not when or why. A pattern class narrows a crowd; only minutiae can name one finger.
- A presumptive test says maybe. Only a confirmatory test says blood, and only DNA says whose.
- One value outside its reference range is a flag, not a verdict.
Make only the claims your evidence supports. Explain what you still cannot tell.
Optional: listen or watch a unit review▸
Need help? Warm-up, timing, and directions▸
💡 Big idea: and biomedical conclusions demand a threshold of , several independent tests that agree, because any single finding can be wrong and a wrong carries real human cost.
- 0:00Course recap: we have collected scene, lab, and evidence. What do we do with all of it?
- 0:10Introduce concept; contrast with single-test conclusions
- 0:20Read the ethics prompt; list one risk of early conclusion and one of withholding conclusion
- 0:32Small-group debate: high certainty vs. reasonable certainty; reference
- 0:54Individual CER writing: evidence threshold, evidence (risks listed), reasoning
- 1:10Share two CERs; preview Tuesday evidence-synthesis work
- • This is the synthesis unit. Everything you learned about scene documentation, testing, and now has to come together into a single, defensible conclusion.
- • But first, a philosophical question: how much evidence is enough? In criminal law the standard is beyond a reasonable doubt. In civil law it is preponderance of evidence. In medicine it is clinical judgment. Which standard should science use?
- • Think about the risks on both sides. Conclude too early and you might blame the wrong cause. Never conclude and the family gets no answer, the public gets no warning, and justice is not served.
- • Today you argue for an evidence threshold. Wednesday you will actually build the evidence board. Thursday you write the conclusion. This is how the course ends.
- • means multiple independent lines of evidence that all point to the same conclusion, each collected by a different method.
- • Concluding too early risks a wrongful finding; never concluding may leave a death unexplained and a family without answers.
- • A reasonable certainty standard requires that the most likely explanation accounts for all available evidence with no major contradictions.
PLTW connection and today's work
Log in to myPLTW and open Project 1.2.6 Case Closed, inside Lesson 1.2 Master the Morgue. Read the project overview and the reporting requirements before Wednesday.
Today's stopping point: You finished the morgue evidence last week. Today starts Project 1.2.6 Case Closed, where you close the case you have been building since the scene. The overview reading should be done by the end of 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.
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
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.
Should we ban use in livestock?
and biomedical conclusions demand a threshold of , several independent tests that agree, because any single finding can be wrong and a wrong carries real human cost.
A review board sorts scientific evidence, stakeholder needs, possible benefits, possible burdens, and uncertainty before choosing a policy.
- Which statements are scientific evidence?
- Which statements express a value or priority?
- Who receives the benefit and who carries the burden?
Use science to estimate consequences, then state the value judgment and tradeoff that determine the decision.
A review-board model organizes reasoning but does not make one ethical principle automatically outweigh every other principle.
- • Evidence cards map to source-backed findings.
- • Stakeholder cards map to affected people and priorities.
- • The recommendation maps to an explicit tradeoff with a named uncertainty.
Driving question: In this death investigation, would you name the today with one strong lab result, or would you demand that the scene, the toxicology, the suspect account, and the all point the same way first?
What you already know: Should we ban use in livestock?
New idea: and biomedical conclusions demand a threshold of , several independent tests that agree, because any single finding can be wrong and a wrong carries real human cost.
Visual or model: F1. F1. A lesson illustration or teaching diagram for Ethics of conclusions. Use it with E1-E3; it is a model or context image, not experimental or patient data. What to notice: Trace the labeled observation or evidence sequence before choosing an explanation.
- Observe or measure the relevant feature in ethics of conclusions.
- Organize the observation with a stable evidence ID.
- Apply this rule: Use science to estimate consequences, then state the value judgment and tradeoff that determine the decision.
- Choose the option the evidence supports and state the limit of the conclusion.
Real biomedical example: In this death investigation, would you name the today with one strong lab result, or would you demand that the scene, the toxicology, the suspect account, and the all point the same way first?
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.
- • synthesis: Building a molecule in the cell, as in synthesis (making a protein from mRNA).
- • : A formal written document presenting the evidence, methods, and conclusions of a scientific investigation, often used to support legal cases.
- • limitation: A weakness or boundary of a study, design, or method that restricts how far its results can be trusted or applied.
- • reliability: The degree to which a measurement, method, or person produces the same dependable result each time under the same conditions.
- • : Evidence given in court by a qualified specialist who explains technical findings, such as DNA or results, to help the jury understand.
- • conclusion: The closing part of an investigation where you state whether the evidence supported your hypothesis and explain what the results mean.
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.
A defensible biomedical decision separates scientific evidence from value judgments, identifies who may benefit or be burdened, and states the uncertainty and tradeoffs that remain.
Limit: Scientific evidence can inform the options and likely consequences, but it cannot choose a single value-neutral answer.
Use science to estimate consequences, then state the value judgment and tradeoff that determine the decision.
Limit: A review-board model organizes reasoning but does not make one ethical principle automatically outweigh every other principle.
You can articulate a standard for sufficient evidence.
Limit: E3 defines the classroom product or success criterion. It is not independent scientific evidence and cannot justify a clinical or causal claim.
PLTW-PBT-2026-10-02 · Simulated classroom evidence scenario
Your role: biomedical investigator
Decision: Your team must decide what the evidence from ethics of conclusions supports before submitting the claim-evidence-reasoning response named on today's page.
- • Postpone the weighting until I check each stream's controls and custody record, because I cannot rank what I have not inspected.
- • Weight each stream by how it was collected, so the controlled lab test with an unbroken custody record carries the most.
- • Give the scene photos, lab tests, suspect story, and equal weight in my report, since all four are real 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 claim-evidence-reasoning response.
Claim ceiling: Today's evidence supports a classroom claim about ethics of conclusions. 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 ethics of conclusions supports before submitting the claim-evidence-reasoning response named on today's page.
Context: A conclusion in biomedical and science earns its confidence from many independent tests that agree, not from one strong result, because any single test can be wrong.
- • T1: Read the prompt: When is the evidence strong enough to conclude?
- • T2: List one risk of concluding too early and one of never concluding.
- • T3: Choose a side: high certainty required vs. reasonable certainty suffices.
- • T4: Argue your claim in your group, referencing .
- • T5: Post a written CER stating your evidence threshold and reasoning.
- • E1: A defensible biomedical decision separates scientific evidence from value judgments, identifies who may benefit or be burdened, and states the uncertainty and tradeoffs that remain.
- • E2: Use science to estimate consequences, then state the value judgment and tradeoff that determine the decision.
- • E3: You can articulate a standard for sufficient evidence.
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 Ethics of conclusions. Trace the labeled observation or evidence sequence before choosing an explanation. 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.
Students often think Students often think one very strong piece of evidence, like a positive toxicology screen, is enough to conclude a by itself.. The trap: It is not enough, because any one test can give a or be contaminated; a conclusion is trustworthy only when several independent lines of evidence, each collected a different way, converge on the same answer with no major contradiction left unexplained.
Claim: A fingerprint examiner is justified in declaring an identification only when the print shows enough matching detail to rule out other sources, not when it merely looks similar at a glance.\nEvidence: A defensible identification rests on convergent detail: overall ridge-flow pattern, the count and position of specific minutiae such as ridge endings and bifurcations, and the absence of any unexplained differences between the crime-scene print and the reference print. Each of these is checked by a separate step, and a second examiner verifies the comparison independently.\nReasoning: Declaring a match too quickly, on a general resemblance alone, risks a false identification that can send the wrong person toward prosecution. Refusing to ever declare a match, on the other hand, wastes reliable evidence and leaves cases unsolved. A reasonable standard, where the corresponding detail is specific enough that no other realistic source fits and no significant difference is left unexplained, balances those two risks. That is why I would require this level of convergent, independently verified detail before declaring an identification.
This model shows the level of evidence and organization needed to complete: A claim-evidence-reasoning paragraph, modeled on a parallel forensic case (declaring a fingerprint identification), arguing what evidence threshold justifies the conclusion, referencing convergent evidence and a risk on each side. It models the format and depth without arguing today's cause-of-death question.
- Write one defensible claim.
- Choose specific evidence that supports the claim.
- Explain the scientific rule that connects the evidence to the claim.
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: Post your CER to Schoology discussion or hand in the written copy before leaving.
- 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 Ethics of conclusions. 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.
Hand-picked readings and interactives for this lesson, from authoritative open organizations and PLTW's own public course outline.
Practice: try a question, then check your answer▸
Claim ceiling for this check: Today's evidence supports a classroom claim about ethics of conclusions. It cannot prove causation, diagnose a real patient, or justify action outside this room.
In a different case, not yours: a single blood test comes back positive for a toxin, but the scene, the autopsy, and the suspect account all point elsewhere. Under a convergent-evidence standard, is one positive test enough to conclude poisoning? Explain.
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?▸
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.
Watch the recorded conclusions-ethics prompt and post a written CER defining how much evidence justifies a cause-of-death conclusion.
John Carroll Philosophy for ChildrenPost your CER to the discussion board or hand in the written copy before leaving.
Class still runs. Complete the online activity above (it's self-guided). Need the concept taught without a teacher? Use this authoritative explainer:
Khan Academy Biology Library- 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.
This week
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