Researchers at a National Weather Center in the northeastern United States recorded the number of 90 Fahrenheit
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Researchers at a National Weather Center in the northeastern United States recorded the number of 90° Fahrenheit days each year since records first started in 1875. The numbers form a normal-shaped distribution with a mean of m 5 9.6 and a standard deviation of s 5 1.9. To see if the data showed any evidence of global warming, they also computed the mean number of 90° days for the most recent n 5 4 years and obtained M 5 12.25. Do the data indicate that the past four years have had significantly more 90° days than would be expected for a random sample from this population? Use a onetailed test with a 5 .05.
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Related Book For
Essentials Of Statistics For The Behavioral Sciences
ISBN: 9781337098120
9th Edition
Authors: Frederick J Gravetter, Larry B. Wallnau, Lori Ann B. Forzano
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