# a - Exercise on May30 1(7.23 We concern the annual earnings...

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Exercise on May30 1. (7.23) We concern the annual earnings of hourly-paid workers at National Bank. The following is the earnings of a random sample of 20 white female workers: 25,249 19,029 17,233 26,606 28,346 31,176 18,863 15,904 22,477 19,102 18,002 21,596 26,885 24,780 14,698 19,308 17,576 24,493 20,612 17,757 Give a 95% confidence interval for the mean annual earnings of all white female hourly workers at this bank. 2. Example of One Sample t Problem. Your business needs to purchase three new copiers. Specifically, the company is interested in finding a copier that has excellent maintainability standards, for example, the average time it takes to repair a machine when it is down. The company that has the best

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price claims their average repair time is 1 hour . You plan to order the copiers from this company unless you find evidence that their claim is false. Before placing an order for the copiers you acquire a random sample of 20 customers who are currently using their machines and collect data from these customers. You find that the average time to repair is 1.25 hours with a standard deviation of .75 hours
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• Summer '07
• LIANG,FANG
• Statistics, Statistical hypothesis testing, Statistical significance, National Bank, cocaine

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