A large accounting firm is concerned about the amount of time its managers spend dealing with email. A random sample of 27 managers taken in the past revealed that they spent, on average, 49.2 minutes per day on email, with a standard deviation of 22.3 minutes. Since then, new procedures have been put in place. Another random sample of 25 managers reveals that they spent, on average, 39.6 minutes per day on email, with a standard deviation of 10.6 minutes. Is there evidence, at the 5% level of significance, that the new procedures have reduced the amount of time managers spend on email? You may assume that the sample data sets appear normally distributed.
Answer to relevant QuestionsConstruct a 90% confidence interval estimate of the average amount of time that is saved for managers spending time on email as a result of the new procedures described in Exercise 6. A large accounting firm is concerned ...Refer to your analysis for Develop Your Skills 11.2, Exercise 6 (page 420). Which of the locations for a new upscale coffee store would be best? A commuter is trying to figure out the fastest way to drive to work in the morning. She keeps track of the times (in minutes) for three different routes on a random sample of mornings. Her records are shown below in Exhibit ...A semi-retired economist is thinking about retiring fully, and he finds himself checking his mutual fund portfolio daily to see how his investments are doing. He notices that the time it takes to log on to his investment ...Refer to Exhibit 11.27 above. Fill in the missing values. • The average for each class • The degrees of freedom (Between Groups, Within Groups, and Total) • The mean squares • The F statistic
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