7.8 A final one-sample t test. The one-sample t statistic for testing H0: =20Ha: <20 based on n=9 observations has the value t=1.85 .

7.8 A final one-sample t test. The one-sample t statistic for testing H0: μ=20Ha: μ<20 based on n=9 observations has the value t=−1.85 .

a. What are the degrees of freedom for this statistic?

b. Between what two values does the P-value of the test fall?

c. If you have software available, find the exact P-value.