A random sample of 20 items is selected from a population. To determine the appropriate critical t-value what number of degrees of freedom should be used?
A) 20
B) 19
C) 21
D) 25

Question

Quizplus · Accepted Answer

The appropriate degrees of freedom to use in this case is n-1, where n is the sample size. Therefore, the degrees of freedom for a random sample of 20 items would be 20-1=19. So, the best choice is B.

A Random Sample of 20 Items Is Selected from a Population