19. 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 con- clusion 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 74 102 61 Past 89 88 97 98 64 85 85 96 87 95 90 95

19. 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 con- clusion 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 74 102 61 Past 89 88 97 98 64 85 85 96 87 95 90 95

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Description: 19. Is Old Faithful Not Quite So Faithful? Listed below are time intervals (min) betweeneruptions 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 inte

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19. 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 con-
clusion 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
102
61
Past
89
88 97
98 64
85 85 96 87 95
90
95

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