Question
The test scores on a 100-point test were recorded for 20 students: 71 93 91 86 7573 86 82 76 5784 89 67 62 7277
The test scores on a 100-point test were recorded for 20 students:
71 93 91 86 7573 86 82 76 5784 89 67 62 7277 68 65 75 84
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. Do the sample data suggest that the average test score is more than 75? Use = 0.05.
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.
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Probability and Random Processes With Applications to Signal Processing and Communications
Authors: Scott Miller, Donald Childers
2nd edition
123869811, 978-0121726515, 121726517, 978-0130200716, 978-0123869814
