Critical Region Method: Student’s t Table 6 of Appendix II gives critical values for the Student’s t distribution. Use an appropriate d.f. as the row header.

For a right-tailed test, the column header is the value of a found in the one-tail area row. For a left-tailed test, the column header is the value of a found in the one-tail area row, but you must change the sign of the critical value t to 2t. For a two-tailed test, the column header is the value of a from the two-tail area row. The critical values are the 6t values shown. Solve Problem 20 using the critical region method of testing. Compare your conclusion with the conclusion obtained by using the P-value method. Are they the same?

AppendixLO1