Participant T1 T2 T3 T4 1 3 3 2 4 4 2 3 4 2 2 4 10 7 7 4
The following data were collected from a study examining the effects of writing a stats exam on cortisol levels (cortisol is a stress hormone). The researcher collected a saliva sample before the exam (T1), another sample 30 minutes later (T2), another sample 60 minutes later (T3) and a last sample 90 minutes later (T4).
A) Please state the null and alternative hypotheses
B) Use the correct analysis of variance (which one is it?) with α = .05 to determine whether these data indicate any significant mean differences in cortisol levels across time. Please calculate SStotal, SSwithin, SSbetween, SSbetween subjects, SSerror, dfbetween, dfwithin, dftotal, dfbetween subjects, dferror, MSbetween, MSerror, and F.
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