Question: Math 9 9. For years, a large discount store has used independent lines to check out customers. Historically, the standard deviation of waiting times is

Math 9

9. For years, a large discount store has used independent lines to check out customers. Historically, the standard deviation of waiting times is 7 minutes. The manager tried a new, single-line procedure. A random sample of 25 customers using this method had a standard deviation of 5 minutes in waiting time. Assuming waiting times are normal, test the claim that the waiting times are reduced by the new procedure using a significance level of 5%

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