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Research Methods and Statistics II

Final exam problems (take-home exam)

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A random sample of students were asked to take a memory test before and after being spun really fast in a sit-and-spin. They were then asked to report whether or not they felt dizzy. Please note that one of the problems below will use a Chi Square to solve. In general, a Chi Square should not be used when your expected value in any cell is less than 5, but ignore this restriction for the purpose of this exam.

Problems:

1. Following the four steps of hypothesis testing, evaluate whether there is a difference between how someone scores on the pretest vs. the posttest (include males and females in the same sample).

2. Following the four steps of hypothesis testing, evaluate whether there is a difference between males and females on whether or not they get dizzy.

3. Following the four steps of hypothesis testing, evaluate whether gender (males vs. females) and dizziness (yes vs. no) affect posttest scores. Use the following descriptive statistics and partially filled summary table to complete your computations and write up.

Descriptive Statistics
Dependent Variable:Posttest
GenderDizzyMeanStd. DeviationN
MaleNo34.25005.058004
Yes28.50002.121322
Total32.33335.006666
FemaleNo27.66674.932883
Yes23.33337.094603
Total25.50005.958196
TotalNo31.42865.769387
Yes25.40005.856625
Total28.91676.3454812

Summary Table:

Sum of SquaresdfMean SquareF
Gender97.4561
Dizzy71.7701
Gender*Dizzy1.4171
Error230.5838

For example:What is the mean of 5, 11, 2?SubjectGenderPretest scorePosttest scoreDizzy1Male3427Yes2Male4630Yes3Male3130No4Male2830No5Male3937No6Male3740No7Female4231Yes8Female3822No9Female2217Yes10Female3330No11Female3422Yes12Female4131NoSheet1SubjectGenderPretest scorePosttest scoreDizzy1Male3427Yes2Male4630Yes3Male3130No4Male2830No5Male3937No6Male3740No7Female4231Yes8Female3822No9Female2217Yes10Female3330No11Female3422Yes12Female4131No6318===ånXX

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