9 Assume for a given study that the null hypothesis asserts

9. Assume for a given study that the null hypothesis asserts the expected value of a phenomenon is 100. A research study results in a 95% confidence interval reported as [98.76, 105.24]. What decision would you make based on this confidence interval? a. Reject the null hypothesis b. Retain the null hypothesis c. Fail to reject the null hypothesis d. A decision cannot be made on a confidence interval; a hypothesis test is required

Solution

since 100 is in this CI, it is plausible that true value of mean is 100

b. Retain the null hypothesis c. Fail to reject the null hypothesis

both of these options are equivalent and correct.