Interpret computer output: The following output from MINITAB presents a confidence interval for the mean difference between matched pairs.

a. Is this a left-tailed test, a right-tailed test, or a two-tailed test?

b. How many degrees of freedom are there?

c. What is the P-value?

d. Can you reject H0 at the α = 0.05 level?

Transcribed Image Text:

Paired T-Test and CI: Before, After Paired T for Before - After N Mean StDev SE Mean Before 12 20.50337 9.69467 2.79861 After 12 17.82398 6.36154 1.83642 Difference 12 2.67399 3.09085 0.89225 95% confidence interval for mean difference: (0.71016, 4.63782) T-Test of mean difference = 0 (vs ne 0): T-Value = 3.00 P-Value = 0.012