Author Question: At a minimum, how many participants would be needed for a matched-subjects design comparing three ... (Read 80 times)

jerry coleman · **on:** Jun 19, 2018

At a minimum, how many participants would be needed for a matched-subjects design comparing three different treatment conditions with 20 scores in each treatment?

a. 20
b. 60
c. 90
d. 120

Question 2

When Likert scaling is used, one of the criteria for the inclusion of an item in the final scale is based on ____.

a. the items statistical independence from the other questions
b. the size of the interquartile range of expert raters
c. whether the item as rated by experts has a high correlation with the total score across items
d. the lowest variability across judges