Re-read any procedure you write (for random assignment or for any experimental design) --> someone who reads your procedure should be able to replicate the exact same process based on your written procedure!
Suggested Midterm Review HW:
- Complete the 2015 AP Free Response
- Score your response--this will allow you to check your understanding, and it will also give you some insight into how I will be grading your midterms!
Thursday HW: Answer the Questions below:
If you write lazy, half-ass answers for 1d, 2, or for your scoring you will not be given full credit. We play how we practice. We perform on tests how we perform on our homework.
1.) Some people claim they can get relief from migraine headache pain by drinking a large glass of ice water. Researchers plan to enlist several people who suffer from migraines in a test. When a participant experiences a migraine headache, he or she will take a pill that may be a standard pain reliever or a placebo. Half of each group will also drink ice water. Participants will then report the level of pain relief they experience. The researchers who collect the pain relief data are not aware what treatment each patient used.
a.) Identify the (two) factors in this study. Then, define the levels for each factor.
b.) Identify the treatments.
c.) Define the response variable.
d.) Does this study involve blinding? Single or double? Explain.
2.) Complete the questions on the middle right slide you have (also below).
3.) The question about Alzheimer's is from the 2016 AP Free Response. After completing this question you MUST score your response using the link below:
- First, just READ THE RUBRIC FULLY--first read the sample responses, then read the scoring breakdown
- Re-read the rubric (question 3), now focusing on the scoring and score each part (a, b, c) as E, P, or I
- Provide a couple notes/bullets about why you earned the score you did--focus on what's missing--what did you need to add to earn an E?
- Give yourself an overall score of 1-4
- 2016 Scoring Rubric (Scroll down to Question 3): CLICK ME!
Today's Class Recap:
- Stamp = midterm review
- Chapter 13 notes...back to Carofanogrow
- Looked at the "worst case scenario" given a map of the 30 plots...
- What is the worst case if we randomly assign treatments (as described yesterday)--why is this the worst case?
- How can we address this?
- New vocab: confounding variables
- Blocking: what is it? how does it work? We'll pick up with this tomorrow....
On Monday or Tuesday we will start class with our chapter 13 vocabulary quiz: here's the list so you can start making your flash cards or a quizlet...
- Experiment (treatments randomly assigned)
- Observational Study (no manipulation of factor--no assignment of treatments)
- Retrospective Observational Study
- Prospective Observational Study
- 4 Principles of experimental design (what are the 4?)
- Factor (the IV, the explanatory variable, the variable we manipulate in an experiment)
- Levels (the specific values of the factor)
- Treatments (the "groups" we create--if there is one factor the levels = the treatments; if there are multiple factors, each factor has its levels, and the treatments are all of the different "overall" groups we create)
- Response Variable (the data we collect--what we're measuring in a study)
- Random Assignment (where does it happen in an experiment?)
- Control Group (a group that receives a baseline treatment, typically a placebo, used for comparison)
- Replication
- Blocking
- Blinding (single v. double blind)
- Placebo
- Confounded/Confounding Variable
- Matching (this is when the subjects in an observational study are paired based on some characteristic--we are specifically pairing two data values)
- Statistically Significant
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