A researcher consented 400 subjects, but 12 dropped out of the ...

[bio_gurl]

A researcher consented 400 subjects, but 12 dropped out of the study before it was completed. The rest finished the study. What was the sample retention rate?
 
  a. 388
  b. 38.8
  c. 3
  d. 97

Question 2

A researcher consented 75 subjects, but 15 dropped out of the study while it was still in progress. What was the sample attrition rate?
 
  a. 15
  b. 15
  c. 20
  d. 75

[micaelaswann]

Answer to Question 1

ANS: D
Sample retention rate formula = number subjects completing study  sample size  100.

Answer to Question 2

ANS: C
Sample attrition rate formula = number subjects withdrawing  sample size  100.
For example, if a study had a sample size of 160 and 40 people withdrew from the study, the attrition rate would be 25.

[bio_gurl]

Excellent

[momolu]

Thanks for the timely response, appreciate it