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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 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 77 90 88 79 57 100 61 88 70 87 83 82 55 80 75 101 60 - Past 90 88 93 94 63 85 84 92 88 91 89 91 Let u, be the recent times and let µ, be the past times. What are the null and alternative hypotheses? O A. Ho: H1 H2 O B. Ho: H= H2 C. Họ H=2 O D. Ho: H1

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 77 90 88 79 57 100 61 88 70 87 83 82 55 80 75 101 60 - Past 90 88 93 94 63 85 84 92 88 91 89 91 Let u, be the recent times and let µ, be the past times. What are the null and alternative hypotheses? O A. Ho: H1 H2 O B. Ho: H= H2 C. Họ H=2 O D. Ho: H1

MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
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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 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 77 90 88 79 57 100 61 88 70 87 83 82 55 80 75 101 60 D Past 90 88 93 94 63 85 84 92 88 91 89 91 Let µ, be the recent times and let µ, be the past times. What are the null and alternative hypotheses? O A. Ho: H1 H2 O B. Ho: H1= H2 H: H4 > H2 H;: H1 = H2 V c. Ho: H1= H2 H;: H1 # H2 O D. Ho: H1 <H2 H;: H1= H2 Calculate the test statistic. t= (Round to two decimal places as needed.)
Transcribed Image Text: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 77 90 88 79 57 100 61 88 70 87 83 82 55 80 75 101 60 D Past 90 88 93 94 63 85 84 92 88 91 89 91 Let µ, be the recent times and let µ, be the past times. What are the null and alternative hypotheses? O A. Ho: H1 H2 O B. Ho: H1= H2 H: H4 > H2 H;: H1 = H2 V c. Ho: H1= H2 H;: H1 # H2 O D. Ho: H1 <H2 H;: H1= H2 Calculate the test statistic. t= (Round to two decimal places as needed.)
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