Problem related to average running time of movies

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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.

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a. Compute the sample mean and the standard deviation.

b. State the null and alternative hypotheses.

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

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

e. Compute the probability of a Type II error if the true running time of movies equals 130 minutes.

Reference no: EM1389861

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