7.7 Another one-sample t test. The one-sample t statistic for testing H0: =40Ha: 40 from a sample of n=13 observations has the value t=2.78 .

7.7 Another one-sample t test. The one-sample t statistic for testing H0: μ=40Ha: μ≠40 from a sample of n=13 observations has the value t=2.78 .

a. What are the degrees of freedom for t?

b. Locate the two critical values t* from Table D that bracket t.

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

d. Is the value t=2.78 statistically significant at the 5% level? At the 1% level?

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