56 61 78 91 89 79 57 100 62 87 70 88 82 96 87 95 | 90 81 74 102 83 95 Recent Past 89 88 97 98 85 85 64
In Exercises 5–20, assume that the two samples are independent simple random samples selected from
Is Old Faithful Not Quite So Faithful? Listed below are time intervals (min) between eruptions of the Old Faithful geyser. The “recent” times are within the past few years, and the “past” times are from 1995. Does it appear that the mean time interval has changed? Is the conclusion affected by whether the significance level is 0.05 or 0.01?
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