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07-11-2022
Mathematics

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Observers studied the amount of time between eruptions of Old Faithful in Yellowstone National Park. For a sample of
18 erutpions, the average length of time between eruptions was 1.6 hours with a standard deviation of 0.24 hours. The
length of time between eruptions appears to be normlly distributed, so it is safe for you to assume they are. Can you
conclude that the average length of time between eruptions is 1.35 hours? Use a 0.05 significance level.

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