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It is estimated that Old Faithful geyser in Yellowstone National Park erupts every 90 minutes. One...

It is estimated that Old Faithful geyser in Yellowstone National Park erupts every 90 minutes. One day was selected at random and the times of Old Faithful’s eruptions were recorded. The number of minutes between eruptions is recorded below. Can you conclude that the mean time between eruptions differs from 90 minutes?

The number of minutes between eruptions are: 93, 94, 91, 88, 99, 89, 94, 96, 76, 109, 94, 96, 91, 98, 96

What is the test value? Round to 2 decimal places.

math   Statistics-And-Probability   
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Answer #1

The statistical software output for this problem is:

Hence,

Test value = 2.00

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