3. Exercise 10.4 (p. 397) Test Scores. The test scores on a 100-point test were recorded for 20 students: 71 73 84 77 a.) Can you reasonably assume that these test scores have been selected from a normal population ...

     3. Exercise 10.4 (p.    397) Test Scores. The test scores on a 100-point test were recorded for   20 students:   71   73   84   77   a.) Can you reasonably assume that these   test scores have been selected from a normal population? Use a stem and leaf   plot to justify your answer.   b.) Calculate the mean and standard   deviation of the scores.   c.) If these students can be considered a   random sample from the population of all students, find a 95% confidence   interval for the average test score in the population.