A researcher wishes to learn how reaction time when driving is affected when participants have consumed 10, 20, 30, or 40 cc of alcohol in one hour. He also wished to learn whether reaction time varies in daytime versus nighttime conditions. In a simulated driving test, both variables are measured. Participants were randomly assigned to the 10, 20, 30, or 40 cc group (Variable A), and each participant within these groups was tested in both day and night conditions (Variable B). Because repeated measures are taken on day and night conditions.
a. error variance for day/night reaction time under each level of alcohol consumption will be reduced.
b. differences in reaction time between day and night conditions for the 20 cc treatment are due to between participant differences.
c. differences in reaction time between day and night conditions for the 10 cc treatment are due to variability resulting from individual differences.
d. the AXB interaction will be confounded by between-participant differences.
e. the test of significance for factor B is more sensitive than that for the A main effect.
Ans: a
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