7.20 A one-sample t test. The one-sample t statistic for testing

H₀: μ = 8

H_a: μ > 8

from a sample of n = 22 observations has the value t = 2.24.

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

2. (b) Give the two critical values t* from Table D that bracket t.

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

4. (d) Is the value significant at the 5% level? Is it significant at the 1% level?

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