Chapter 10, Problem 3CRE

(a)

To determine

To Explain: In this case the random and independent conditions are satisfied.

Answer to Problem 3CRE

Independent and random conditions are met.

Explanation of Solution

Random: 45 Women have been randomly assigned to the control group, where the remaining women have been assigned to the undermining group, thereby fulfilling the random criterion.

Independent: Satisfied, as the sample size is smaller than 10 % of the population

(b)

To determine

To Explain: the reason why a two-sample t test is still acceptable.

Answer to Problem 3CRE

Normal requirement is met.

Explanation of Solution

They both have a sample size of 45. Because both samples have a sample size of at least 30, it can be concluded that both samples are normally distributed and hence met the usual criterion.

(c)

To determine

To Explain: The P-value.

Explanation of Solution

Given:

P < 0.01=1%

This means that since all groups have a mean sample population, the possibility of the mean difference being predicted as in this or more extreme study is 1%.