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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 with the objective of reducing the turnaround time for stress tests. Turnaround time is defined as the time from when a test is ordered to when the radiologist signs off on the test results. Initially, the mean turnaround time for a stress test was 68 hours. After incorporating changes into the stress-test process, the quality improvement team collected a sample of 50 turnaround times. In this sample, the mean turnaround time was 32 hours, with a standard deviation of 9 hours.
a. If you test the null hypothesis at the 0.01 level of significance, is there evidence that the new process has reduced turnaround time?
b. Interpret the meaning of the p-value in this problem.
In an experiment in which a die was rolled 188 times it was counted up how many times each face came up. The results are as follows:
A partial computer output from a regression analysis as follows. The regression equation is:
According to the empirical rule, if the data from a "bell-shaped" normal distribution ______ percent of the observation will be contained between 2 standard deviations below the mean and 2 standard deviations above the mean.
An auditor for a Health Maintenance service of Georgia reports 40% of policyholder 55 years or older submit a claim during the year. Fifteen policyholders are randomly selected for company records.
The lifetime of a 2-volt non-rechargeable battery in constant use has a Normal distribution with a mean of 516 hours and a standard deviation of 20 hours. The proportion of batteries with lifetimes exceeding 520 hours is approximately.
Under proposed plan, how long, on average, will patient stay in ER? On average, how long will Potential Admit stay in ER?
According to the U.S. Census Bureau, the mean household income in the United States in 2000 was $63,091 and the median household income was $50,054.
Solve different inventory control problems using an appropriate OR method.
Determine the probability that person selected has blood type O? Given that person selected is a male, determine the probability that their blood type is AB?
When is a factorial ANOVA used? Give Example. When is a chi square test appropriate? Give Example. When does linear regression versus multiple regression apply? Give Example.
Average electric use was studied.a previously known population standard deviation was 450KWH. a sample of 81 houses was studied and found to have a mean of 1858 KWH. Find the 95% confidence interval for the true mean.
You are a realtor with a small business. You use a simple 2 variable linear regression analysis for quick first glance house price estimates using square footage of the house.
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