Question

The difference in the average score on Test1 for those who took the Practice Test 1 and those who did not take the Practice Test 1 is equal to

Answer 1

For Those who took the practice test:

n = 37

∑x = 2763.89

Mean, x̅2 = 74.6997

For Those who did not take the practice test:

n = 59

∑x = 3571.99

Mean, x̅2 = 60.5422

The difference in average score, x̅2 - x̅1 = 74.6997 - 60.5422 = 14.1575

Answer: 14.1575