Chapter 15.1, Problem 5SE

a.

To determine

State the null and alternative hypothesis.

b.

To determine

Find the degrees of freedom for the contingency table.

c.

To determine

Find the critical value of chi-square from Appendix E or from Excel’s function at 0.025 level of significance.

d.

To determine

Check whether the data provide sufficient evidence to conclude that the completion rate and prenotification are statistically independent or not and make conclusion.

e.

To determine

Find the cell that contribute most to the chi-square statistics.

f.

To determine

Find the expected frequencies that are too small.

g.

To determine

Interpret the p-value and calculate p-values using Excel function if necessary.

h.

To determine

Perform a two-tailed, two-sample z test for ${\pi }_1={\pi }_2$ and verify that $z^2$ is the same as the chi-square statistics.