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Southside Hospital in Bay Shore, New York, commonly conducts stress tests to study the heart muscle after a person has a heart attack. Members of the diagnostic imaging department conducted a quality improvement project to try to reduce the turn-around time for stress tests. Turn around time is defined as the time from when the test is ordered and when the radiologist signs off on the test result. Initially, the mean turn around time for a stress test is 68 hours. After incorporating changes into the stress test process, the quality improvement team collected a sample of 50 turn around times. In this turn around time, the mean turn around time was 32 hours, with a standard deviation of 9 hours.
a) Construct a 95% confidence interval for the population mean turn around time.
b) Interpret the interval constructed in (a).
c) Do you think the quality improvement project was a success? Explain.
Calculate the mean and the standard error of the sampling distribution of the sample means. Also, find the mean and standard error of the sampling distribution for samples of size 5.
suppose that the mean score on a creativity test is 20 and the standard deviation is 5. you are told that the
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refer to the baseball dataset provided on the authors website. over the last 10 years the mean attendance per team
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A library checks out an average of 250 books per day, with a standard deviation of 75 books. If a sample of 36 days of operation is selected and the sample mean is computed,
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to estimate the mean age for a population of 4000 employees a simple random sample of 40 employees is selected.a. would
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