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9. Consider the e-billing case. The mean and the standard deviation of the sample of n = 65 payment times are x = 18.1693 and

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9. Consider the e-billing case. The mean and the standard deviation of the sample of n = 65 payment times are x = 18.1693 and s = 3.9535. Test Ho: / = 18.4 versus Ha: /

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