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The mean number of close friends for the population of peopleliving in the U.S. is 5.7. An investigator predicts that the meannumber of close friends for introverts will be significantlydifferent than the mean of the population. The mean number of closefriends for a sample of 26 introverts is 6.5. The standarddeviation of scores in this sample is 1.3. Do these data supportthe investigator's prediction?

a. State the null and alternative hypotheses in symbolicform.

b. Set the criteria for making a decision. What are the criticalvalues? 
(Use a = .01) 


c. Compute the appropriate test statistic. Show your work.

d. Based on your results, evaluate the null hypothesis. CircleOne: Reject H0 e. State your conclusions in terms of the originalresearch.

f. Compute Cohen’s d and interpret the effect (i.e., is it asmall, medium, or large effect) g. Compute the 99% confidenceinterval for this study

Fail to Reject H0

Interpret the 99% confidence interval below.
We can be_______________________________________________________________that, over repeated sampling, the

interval between____________________________________ and_________________________________________

contains the true population mean in_________________________________________________________ for

________________________________________________________________________________________________.