Question

In: Statistics and Probability

A cellular phone service provider is offering a new calling plan that it claims will result...

A cellular phone service provider is offering a new calling plan that it claims will result in an average savings of more than 20% for its customers who switch to the plan. To evaluate this claim, a consumer watchdog organization contacted a random sample of this provider's customers who enrolled in the new plan and computed their individual savings (as a percentage of their original monthly bill).

PctSavings(%)

9.84

14.13

15.01

23.47

19.07

21.37

19.64

22.38

26.56

22.52

23.11

18.77

32.77

(1) Use Minitab to construct a normal probability plot to check the normality condition. Report the value of the Anderson-Darling statistic (AD) below.

AD = (rounded to 3 decimal places; 2 for Minitab Express)

(2) Use Minitab to conduct a test to see if there is enough evidence for the provider's claim. Report the value of the appropriate test statistic and the p-value.

Test Statistic Value =  (rounded to 2 decimal places)
p-value =  (rounded to 3 decimal places; 4 for Minitab Express)

Solutions

Expert Solution

orchestra answered 2 years ago
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