Nancy believes that the average running time of movies is equal to 140 minutes. A sample of

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Nancy believes that the average running time of movies is equal to 140 minutes. A sample of 4 movies was taken and the following running times were obtained. Assume the population of the running times is normally distributed.

150

180

170

a. Compute the sample mean and the standard deviation.

b. State the null and alternative hypotheses.

c. Calculate the test statistic.

d. Using the critical value approach, test the hypotheses at the 10% level of significance.

e. Using the p-value approach, test the hypotheses at the 10% level of significance.

Related Book For answer-question

Business Statistics a decision making approach

ISBN: 978-0133021844

9th edition

Authors: David F. Groebner, Patrick W. Shannon, Phillip C. Fry

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Posted Date: Sep 03, 2018 12:35 AM

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Nancy believes that the average running time of movies is equal to 140 minutes. A sample of

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Expert Answer:

a1 The sample mean is obtained as shown below From the information Nancy believed that the average running time of movies is equal to 140 minutes The sample size is 4 that is 150 150 180 and 170 Instr... View the full answer

Business Statistics a decision making approach

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