Question

The enrollment time in months until degree completion for 10 randomly selected graduates from a particular college are listed below. Find a 90% confidence interval for the true mean enrollment time for graduates of that school. Assume enrollment times are normally distributed.

52, 55, 48, 57, 64, 52, 45, 48, 57, 55

Group of answer choices

(48.9, 57.8)

(49.9, 56.7)

(50.4, 56.2)

(50.9, 55.7)

(50.1, 56.5)

Answer 1

Here, Zcritical value is used.Because,in question it is clear that "normally distributed"