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Listed below are time intervals (min) between eruptions of a geyser. Assume that the "recent" times...
Listed below are time intervals (min) between eruptions of a geyser. Assume that the "recent" times are within the past few years, the "past" times are from around 20 years ago, and that the two samples are independent simple random samples selected from normally distributed populations. Do not assume that the population standard deviations are equal. Does it appear that the mean time interval has changed? Is the conclusion affected by whether the significance level is 0.10 or 0.01? Recent 79 91 89 80 56 101 63 87 69 89 83 84 56 80 73 103 62 Past 89 89 93 94 65 86 84 92 88 91 88 91 Let mu1 be the recent times and let mu2 be the past times. What are the null and alternative hypotheses? Find the test statistic and the P values?
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63
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68
70
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46
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1
76
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88
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5
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58
6
66
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75
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93
9
66
65
10
92
86
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80
53
12
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86
49
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15
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16
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23
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