7.21 Another one-sample t test. The one-sample t statistic for testing

H₀: μ = 40

H_a: μ ≠ 40

from a sample of observations has the value .

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

2. (b) Locate 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 statistically significant at the 5% level? At the 1% level?

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