Dr. Apple needs extroverts for an upcoming study. He gives out questionnaires to his students and finds that 15 students rate themselves as "very extroverted." To ensure that his sample as a whole is extroverted, he administers the Reed Extroversion Inventory (REI) to the 15 students. Using the scores given below, determine if this sample of students is indeed extroverted. Assume that non-extroverted students will score 25 on the REI, and that = .05.

a. What is the alternative hypothesis for this experiment?

b.

Calculate the appropriate hypothesis statistic.

c. Give the

critical value for the statistic, whether you reject or fail to reject the null

hypothesis and your

conclusion

about the extroversion of his sample.

Scores: 23

27 26 26 24 25 27 25

26 25 25 25

28 26 26