Author Question: The descriptive measure of dispersion that is based on the concept of a deviation about the mean is ... (Read 69 times)

Zoey63294 · **on:** Aug 1, 2018

The descriptive measure of dispersion that is based on the concept of a deviation about the mean is _____.
a. the range
b. the interquartile range
c. both the range and the interquartile range
d. neither the range nor the interquartile range

Question 2

The Admissions officer for the graduate programs at the University of Pennsylvania believes that the average score on the LSAT exam at his university is significantly higher than the national average of 1,300 . An accepted standard deviation for LSAT scores is 125 . A random sample of 25 scores had an average of 1,375 . Calculate the value of the test statistic and set up the rejection region at the 0.025 level. What is your conclusion?

lgoldst9 · **Reply #1 on:** Aug 1, 2018

Answer to Question 1

d

Answer to Question 2

Test statistic: z = 3.0
Rejection region: z > z.025 = 1.96
Conclusion: Reject H0 . There is enough statistical evidence to infer that the average LSAT for all graduate students at the University of Pennsylvania is higher than 1,300.