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 ​?   a. The test statistic is ​(Round to two decimal places as​ needed.)   b. The​ P-value is ​(Round to three decimal places as​ needed.)

MATLAB: An Introduction with Applications
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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 ​?

 

a. The test statistic is

​(Round to two decimal places as​ needed.)
 
b. The​ P-value is

​(Round to three decimal places as​ needed.)

Recent
Past
79 90 88 79 56 100 62 86 71 87 82 83 55 80 74 103 62
90 87 93 94 65 85 86 92 88 91 88 91
Transcribed Image Text:Recent Past 79 90 88 79 56 100 62 86 71 87 82 83 55 80 74 103 62 90 87 93 94 65 85 86 92 88 91 88 91
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