Question: 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

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?

Recent 78 91 89 79 57 100 62 87 70 88 82 83 56 81 74 10261 Past 89 88 97| 98 64 85|85 96 87 95 90 95

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