Chapter 9, Problem 35PS

a.

To determine

Test whether there is an evidence that the mean time spent on Facebook daily is different from 60 minutes at $0.05$ level of significance.

b.

To determine

Determine the assumption that must be made about the population distribution to conduct $t\text{ test}$ in part (a).

c.

To determine

List the various ways to evaluate the assumption made in (b).

d.

To determine

Evaluate the assumption of normality made in (b) and determine whether or not the assumption required to conduct the $t\text{ test}$ in (a) is valid.