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A researcher working at a particular company wants to know if workers' health would improve if they were given extra days 'off. In this company, all workers undergo a standard physical exam twice a year and after each exam an overall health rating (higher scores mean better health) is automatically provided to the company. To conduct the study, the researcher selected five workers at random. She then arranged to have these five workers receive an additional 2 days off every month over the period between health exams. She then compared the health scores on the two exams. Do the results shown in the table below support the notion that extra days off improves health? (Use the .05 level.) Health Rating, Before and After Period of Extra Days Off 5 Worker Before After
WORKER BEFORE AFTER
A 75 81
B 66 67
C 44 46
D 86 88
E 89 89
What is the Xd-X
What is the X
What is the Σ (Xd-X )2
Queen's School of Business in Kingston, Ontario requires a minimum LSAT score of 157 for admission. What is the z-score for a score of 157? Round to three decimal places.a
Check the assumptions and conditions.- Perform the test and find the P-value.- State your conclusion.- Do you think this difference is meaningful? Explain.
Does every student at this community college have the same chance of being selected for inclusion in the sample? Explain.
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estimate the rate in galhr that your car uses gasoline when it is being driven on an interstate highway. determine how
What are the three defining characteristics of any sampling distribution of means?
For a group of 10 men subjected to a stress situation, the mean number of heartbeats per minute was 126, and the standard deviation was 4. Find the 95% confidence interval of the true mean.
The following procedure aims at approximating the integral of g over the unit interval. Pick n points uniformly in the unit square
The histograms show the distribution of the estimated numbers of hours per month spent on social services for project boys (left) and project girls (right).
The target temperature is 550°C. What are the mean and standard deviation of the number of degrees off target, D = X - 550?
Please show me or explain to me how to get the median of scores. To do so you can use anything, for example you can use the following
You are investigating the flight characteristics of different kinds of birds. You collect a sample of 33 European swallows (Hirundo rustica) and measure their air-speed velocity in a borrowed wind tunnel.
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