A study was done on proctored and nonproctored tests The res

A study was done on proctored and nonproctored tests. The results are shown in the table. Assume that the two samples are independent simple random samples selected from normally distributed populations, and do not assume that the population standard deviations are equal. Complete parts (a) and (b) below.

Proctored

Nonproctored

mu

mu 11

mu 22

n

33

32

x overbarx

76.29

81.67

s

10.76

18.34

use a .01 significance level

Solution

H0: mu1 = mu2

Ha: mu1 not equal to mu2

The two samples are not significantly different.