A sample mean of M 25 corresponds to a zscore of 250 Determ

A sample mean of M = 25 corresponds to a z-score of -2.50. Determine which side the body is on at this z-score and determine the proportion in the body.

a. Body is Left and p = .9938

b. Body is Right and p = .0062

c. Body is Left and p =.0062

d. Body is Right and p = .9938

Solution

negtaive z-score are at the left side. So Body is left. And area correponding to z-score -2.50 from z-table is 0.0062. So required proportion is p=0.0062. Therefore option (b) is correct.