The difference of the sample means of two populations is 346

The difference of the sample means of two populations is 34.6, and the standard deviation of the difference of the sample means is 11.9. The 95% confidence interval lies between A and B.

A being ….

a. -11.9

b. -23.8

c. -35.7

d. -45.4

and

B being …

a. +11.9

b. +23.8

c. +35.7

d. +45.4

Solution

mean=34.6 and standard deviation=11.9

desired confidence level=95%

confidence interval=+- 11.66

range lies between 22.94 to 46.26