What is one weakness of correlational studies?
A) Prevalence of cases
B) Incidence of cases
C) Relative risk of groups
D) Self-selection of groups
Question 2
What is a null hypothesis?
A) There is a positive relationship between research variables.
B) There is a negative relationship between research variables.
C) There is a false positive relationship between research variables.
D) There is no relationship between research variables.