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 Past 79 90 90 87 89 93 78 94 57 64 101 84 61 84 87 92 71 88 88 91 82 91 82 91 57 82 74 103 62 Calculate the test statistic. t=enter your response here (Round to two decimal places as needed.)
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 Past 79 90 90 87 89 93 78 94 57 64 101 84 61 84 87 92 71 88 88 91 82 91 82 91 57 82 74 103 62 Calculate the test statistic. t=enter your response here (Round to two decimal places as needed.)
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN:9780079039897
Author:Carter
Publisher:Carter
Chapter10: Statistics
Section10.5: Comparing Sets Of Data
Problem 14PPS
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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
0.10
or
0.01?
Recent Past
79 90
90 87
89 93
78 94
57 64
101 84
61 84
87 92
71 88
88 91
82 91
82 91
57
82
74
103
62
79 90
90 87
89 93
78 94
57 64
101 84
61 84
87 92
71 88
88 91
82 91
82 91
57
82
74
103
62
Calculate the test statistic.
t=enter your response here
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