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Changes in ?nancial support for students in recent years have caused controversy. Suppose we want to investigate whether there is ?nancial hardship, and, if so, how much, among students. Discuss brie?y how we might use a survey to do this.
• Suggest a target population. Who, exactly, are the "students" in question?
• What kind of sampling should we use?- Strati?ed?- Cluster?- Multi-stage?
Suggest a choice of sampling method and comment on why you have made this choice.
• Comment on the extent to which we will be able to draw any conclusions about whether potential students are deterred from starting courses because of the changes.
You are conducting an evaluation of services at a social service agency. One of the evaluation issues is finding out whether male clients rate the quality of casework services as highly as do female clients.
Assuming that a difference (Δ) of 2 lbs. in the mean was important to detect, a maximum Type I Error (α) level of 5%, and the desire to run a two-tailed test, then:
Draw a box-and-whisker plot for the data set. Find the variance and the standard deviation. please help me as soon as possible please!!! thank you
How large sample should be selected in order to obtain p estimate with a bound of 0.08 on the error of estimation.
Lemarks Studios is looking for advertiser dollars to help with production costs on its newest blockbuster movie. Lemarks Studios has several companies that want product placement in the film.
Computer stocks currently provide an expected rate of return of 16%. Dell, a large computer company, will pay a year-end dividend of $2 per share.
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study so that the two factors are smoking level and gender.
A clinical investigator is interested in understanding the relationship between demographic factors and congestive heart failure, measured by a cardiac index (CI).
Set-up/solve the problem graphically. (How many ceiling fans and how many floor fans should be made?)
The flashlight batteries produced by one of the northern manufacturers are known to have an average life of 60 hours with a standard deviation of 4 hours. Use Chebyshev's theorem to answer the following questions.
Use this information to make a 95% confidence interval to evaluate true average number of copies made each day at this company.
Testing indicates that the lifetimes of a shipment of disposable butane lighters are normally distributed with a mean of 1000 lights and a standard deviation of 100. What percentage of these lighters will:
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