The manager of an online shop wants to determine whether the mean length of calling time of its customers is significantly less than 3 minutes. A random sample of 75 customers was taken. The average length of calling time in the sample was 2.9 minutes with a standard deviation of 0.5 minutes. At a 0.05 level of significance, it can be concluded that the mean of the population is significantly greater than 3. acceptably not different from 3.10 significantly less than 7. significantly less than 3.
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Null hypothesis: The mean length of calling time of the population is not significantly less than 3 minutes. Alternative hypothesis: The mean length of calling time of the population is significantly less than 3 minutes. Show more…
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Exhibit 9-4: The manager of a grocery store has taken a random sample of 100 customers. The average length of time it took the customers in the sample to check out was 3.1 minutes, with a standard deviation of 0.5 minutes. We want to test to determine whether or not the mean waiting time of all customers is significantly more than 3 minutes. Refer to Exhibit 9-4. At 95% confidence, it can be concluded that the mean of the population is: significantly greater than 3, not significantly greater than 3, significantly less than 3, significantly greater than 3.18
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