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The Medical Rehabilitation Foundation reports that the average cost of rehabilitation for stroke victims is at least $24,500. To see if the average cost might be different at a particular hospital, a researcher selects a random number sample of 50 stroke victims and finds that the average cost is $25,225. The standard deviation of the population is $1,300.
a) At α = .01, can it be concluded that the average cost of stroke rehabilitation at a particular hospital is at least $24,500?
b) Construct a 90% confidence interval
What percent of healthy young adults has osteoporosis by the WHO criterion? Suppose that the standard deviation is the same as for young adults. What percent of this older population has osteoporosis?
Complete the problems below and submit your work in an Excel document. Be sure to show all of your work and clearly label all calculations. All statistical calculations will use the Employee Salary Data Set.
Fuel Consumption and Cars Biodiesel fuels are made from vegetable oils or animal fats and may be used instead of conventional diesel fuel.
For a randomly chosen prisoner, are the event that the person returns to prison and the event that the person is a woman independent?
an investigator hypothesizes that cholesterol levels in children migt be affected by educating their parents on proper
the time between arrivals of large comets on earth is exponentially distributed with a mean of one year.a. what is the
What is the real world value of the y-intercept and slope in a regression equation? Other than statistics problems, why should I care?
Conduct a global test of hypothesis to determine whether any of the regression coefficients are not zero. Use the .05 significance level
Is there a relationship between whether or not someone completed and returned their 2011 census report and their opinion of gun control?
What is the probability of rejecting the null hypothesis when there are four groups, the sum of the squared treatment effects is 6, the error variance is 3, the group sample sizes are 4, and ε is .01?
Calculating Regression from the Financial Data of a Company
Refer to the real estate data in Blackboard. Determine whether there is a difference in the mean selling price of homes with an attached garage and homes without an attached garage.
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