Restaurant Service Times (a) Construct the empirical

Chapter 15, Problem 15.1.1

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Restaurant Service Times (a) Construct the empirical cumulative distribution function for the data set of restaurant service times given in DS 6.1.4. (b) Draw 95% condence bands around the empirical cumulative distribution function. (c) Is it plausible that the service times are normally distributed with a mean of 70 seconds and a standard deviation of 20 seconds? (d) Is it plausible that the service times are exponentially distributed with a mean of 70 seconds? (e) Consider the null hypothesis that the median service time is no longer than 65 seconds. What statistic is used by the sign test procedure to test this null hypothesis? What is the p-value? (f) Test the null hypothesis in part (e) using the signed rank test. (g) Use the sign test and the signed rank test to obtain 95%condenceintervalsonthemedianservicetime.

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