8 Assume for a given study that the null hypothesis asserts

8. Assume for a given study that the null hypothesis asserts the expected value of a phenomenon is 10. A research study results in a 95% confidence interval reported as [7.142, 9.865]. What decision would you make based on this confidence interval? a. Fail to reject the null hypothesis b. Retain the null hypothesis c. A decision cannot be made on a confidence interval; a hypothesis test is required d. Reject the null hypothesis

Solution

since 10 is not in this CI, it is not plausible that true mean is 10

d. Reject the null hypothesis that true mean = 10