Exam 1

1. Metainformation

   Tag	Value
   file	Inferential_Statistics_uu-Twoway-ANOVA-854-en_uu-Twoway-ANOVA-854-en
   name	uu-Twoway-ANOVA-854-en
   section	Inferential Statistics/Parametric Techniques/ANOVA/Twoway ANOVA
   type	schoice
   solution	FALSE, FALSE, FALSE, TRUE
   Type	Case
   Program
   Language	English
   Level	Statistical Reasoning

   Question

   A group of researchers looks at the effect of gender and whether or not a smiley-face is applied on accounts and average tip percentage. The researchers suggest including the following sentence in the research paper:

   The study finds that there are no significant differences in average tip percentages between accounts with a smiley face and those without a smiley face, F = 2, p = .135.

   Are the researchers correct to report this? Why or why not?

   
   
   1. FALSE: Yes, because the p-value is greater than 0.05 and then no difference is present and it is not important to look further
   2. FALSE: Yes, because the interaction effect results are significant and so there are no differences between the waiters and waitresses
   3. FALSE: No, because the F value is equal to 2, and that is almost equal to 1 and then we cannot draw reliable conclusions about whether or not there are differences between the accounts with and the accounts without smiley-face
   4. TRUE: No, because she has to look at the interaction effect first, and it turns out that there are differences between the accounts with a smiley-face and those without, but only within the two gender groups