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In: Statistics and Probability

With individual lines at its various windows, a post office finds that the standard deviation for...

With individual lines at its various windows, a post office finds that the standard deviation for waiting times for customers on Friday afternoon is 7.2 minutes. The post office experiments with a single, main waiting line and finds that for a random sample of 27 customers, the waiting times for customers have a standard deviation of 4.35 minutes on a Friday afternoon. What is the Test Statistics to test the claim that a single line causes lower variation among waiting times for customers?

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Expert Solution

Let denotes the true standard deviation for waiting times for customers on Friday afternoon.

There is sufficient evidence to support the claim that a single line causes lower variation among waiting times for customers.

orchestra answered 3 years ago
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