Alpha Geek
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11-30. The Celltone company is in the business of providing cellular phone coverage. Recently, it conducted a study of its customers who have purchased either the “Basic Plan” or the “Business Plan” service. At issue is the number of minutes of use by the customers during the midnight to 7:00 A.M. time period Monday through Friday over a four-week period. The belief of Celltone managers is that the standard deviation in minutes used by Business Plan customers will be less than that for the Basic Plan customers. Data for this study are in a file called Celltone. Assume that the managers wish to test this using a 0.05 level of significance. Determine if the standard deviation in minutes used by Business Plan customers is less than that for the Basic Plan customers using an alpha level equal to 0.05.