Author Question: A(n) _______________ threat is any factor that leads to differences between the groups at the start ... (Read 77 times)

viki · **on:** Jun 19, 2018

A(n) _______________ threat is any factor that leads to differences between the groups at the start of the study.

Fill in the blank(s) with correct word

Question 2

Which of the following is a disadvantage of using a within subjects design?

a. the variability due to participants cannot be estimated statistically
b. treatment order may have an effect on the dependent variable
c. a large number of participants is required
d. the experimental and control groups may not be equivalent to one another