Marguerite is conducting a study in which she rewards children's success at a difficult task with nothing (control), a small cookie, or a large cookie with icing. She wants to see whether the size of the reward affects how long the children will work on a later problem.
How many factors are in this study?
How many levels are in this study?
Is it a between or within subjects study?
Fahkir is conducting a study about how sleep deprivation affects errors on a cognitive task. Participants are randomly assigned to get 3, 6, or 9 hours of sleep in a sleep lab; then they complete the reaction time task. The data are as follows:
Highly Sleep Deprived: 15, 20, 7
Mildly Sleep Deprived: 20, 27, 31
Not Sleep Deprived: 34, 35, 39
Fill in the table below:
Source of Variation | SS | df | MS | F
Between groups | | | |
Within groups | | | |
Total | | | |
Finally,
What is the critical value?
What decision should you make? choose from the options below
- Reject the null - our results are not significant
- Reject the null - our results are significant
- Fail to reject the null - our results are not significant
- Fail to reject the null - our results are significant
What is the effect size (eta-squared)? Remember, round to the second decimal)
What is Tukey's HSD (alpha = .05)?
Using Tukey's HSD, which conditions are significantly different from each other? (choose from the options below)
- M1 and M2
- M1 and M3
- M2 and M3
- None of the above
Let's fill out our ANOVA table:
Source of Variation | SS | df | MS | F
Between Groups | 20 | b | c | e
Within Groups | a | 15 | d |
Total | 50 | 17 | |
a. What is SSw?
b. What is dfbet?
c. What is MSbet?
d. What is MSw?
e. What is F