Example 8 in Section 9.3 described a study that used a cognitive behavioral therapy to treat a
Question:
T-Test of difference = 0 (vs not =):
T-Value = 1.67 P-Value = 0.102 DF = 50
a. Report and interpret the P-value for testing H0: μ1 = μ2 against Ha: μ1 μ2.
b. Summarize the assumptions needed for the analysis in part a. Based on the box plots, would you be nervous if you had to perform a one-sided test instead? Why?
c. The reported 95% confidence interval tells us that if the population mean weight change is less for the cognitive behavioral group than for the control group, it is just barely less (less than 1 pound), but if the population mean change is greater, it could be nearly 8 pounds greater. Explain how to get this interpretation from the interval reported.
d. Explain the correspondence between the confidence interval and the decision in the significance test for a 0.05 significance level.
Step by Step Answer:
Statistics The Art And Science Of Learning From Data
ISBN: 9780321755940
3rd Edition
Authors: Alan Agresti, Christine A. Franklin