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 normaly distributed populations. Do not assume that the population standard deviations are equal. Does it appear that the mean time interval has changed? the conclusion affected by whether the significance level is 0.10 or 0.017 79 91 60 79 56 101 62 87 70 89 83 83 57 81 74 101 61 O 89 7 93 94 64 85 85 2 86 91 90 91 Recent Past

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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 normaly distributed populations. Do not assume that the population standard deviations are equal. Does it appear that the mean time interval has changed?
the conclusion affected by whether the significance level is 0.10 or 0.017
79 91 60 79 56 101 62 87 70 89 83 83 57 81 74 101 61 O
89 7 93 94 64 85 85 2 86 91 90 91
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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 normaly distributed populations. Do not assume that the population standard deviations are equal. Does it appear that the mean time interval has changed? the conclusion affected by whether the significance level is 0.10 or 0.017 79 91 60 79 56 101 62 87 70 89 83 83 57 81 74 101 61 O 89 7 93 94 64 85 85 2 86 91 90 91 Recent Past

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