10. Past experience has shown that the average length of time for students to enroll in college is 3 hours and 20 minutes. A new enrollment procedure is being tested. If a random sample of 81 students has an average of 2 hours and 30 minutes with a standard deviation of 54 minutes, can it be said that the new enrollment procedure in terms of reducing the average time for enrollment? Use a 0.01 level of significance.
10. Past experience has shown that the average length of time for students to enroll in college is 3 hours and 20 minutes. A new enrollment procedure is being tested. If a random sample of 81 students has an average of 2 hours and 30 minutes with a standard deviation of 54 minutes, can it be said that the new enrollment procedure in terms of reducing the average time for enrollment? Use a 0.01 level of significance.
11. A car dealer recommends that transmissions be serviced at 18 750 kilometers. In order to see whether his customers are adhering to this recommendation, the dealer selects a
sample of 40 customers and finds that the average kilometers of the cars serviced is 19, 035 kilometers. The standard deviation of the sample is 1 052. At 0.10 level of significance,
determine of the owners are servicing cars at 18, 750 kilometers.
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