If we test the mean amount that alcoholic subjects drink before ...

[pepyto]

If we test the mean amount that alcoholic subjects drink before and after therapy, and that difference is NOT statistically significant, this could mean
 
  a. the therapy was not effective.
  b. the sample size was too large.
  c. the study lacked sufficient power.
  d. a and c

Question 2

We are evaluating a method of therapy for extremely underweight adolescent girls. If we weighed our subjects at the beginning and end of therapy, a difference in weight could mean
 
  a. that our therapy worked.
  b. that people gain weight over time regardless of what we do.
  c. that our scales changed due to repeated use.
  d. all of the above

[peter]

Answer to Question 1

D

Answer to Question 2

D

[pepyto]

TYSM

[brbarasa]

Excellent