Entries by Grace Wahito

In a random sample of 24 people, the mean commute time to work was 32.7

March 25, 2020 in /by

In a random sample of 24 people, the mean commute time to work was 32.7 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a​ t-distribution to construct a 99% confidence interval for the population mean mu. What is the margin of error of mu​? Interpret the results. The confidence interval for […]

 

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A humane society claims that less than 32% of U.S.

March 25, 2020 in /by

A humane society claims that less than 32% of U.S. households own a dog. In a random sample of 396 U.S.​ households, 151 say they own a dog. At alpha = 0.01​, is there enough evidence to support the​ society’s claim? ​(a) Find the critical​ value(s) and identify the rejection​ region(s). The critical​ value(s) is/are negative_____ […]

 

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You receive a brochure from a large university

March 25, 2020 in /by

You receive a brochure from a large university. The brochure indicates that the mean class size for​ full-time faculty is fewer than 33 students. You want to test this claim. You randomly select 18 classes taught by​ full-time faculty and determine the class size of each. The results are shown in the table below. At […]

 

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One​ study, based on responses from 1,023 randomly selected​ teenagers,

March 25, 2020 in /by

One​ study, based on responses from 1,023 randomly selected​ teenagers, concluded that 43% of teenagers cite grades as their greatest source of pressure. Use a 0.05 significance level to test the claim that fewer than half of all teenagers in the population feel that grades are their greatest source of pressure. Find the test statistic. […]

 

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