Chapter 8.4, Problem 18P

(i)

To determine

Check the sample mean by using the calculator.

Check the sample standard deviation by using the calculator.

(ii)

To determine

(a)

Find the level of significance.

State the null and alternative hypothesis.

Identify the tail of test.

(b)

Identify the sampling distribution to be used.

Mention the assumption to test.

Find the sample test statistic.

Find the t value.

(c)

Find the P-value.

Draw the sampling distribution by showing the area corresponding to the P-value.

(d)

Check whether the null hypothesis is rejecting or fail to reject.

Identify whether the data statistically significant at level 0.05 or not.

(e)

Interpret the conclusion in the context of the application.