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Question: Anorexia. Hearing anecdotal reports that some patients undergoing treatment for the eating disorder anorexia seemed to be responding positively to the antidepressant Prozac, medical researchers conducted an experiment to investigate. They found 93 women being treated for anorexia who volunteered to participate. For one year, 49 randomly selected patients were treated with Prozac and the other 44 were given an inert substance called a placebo. At the end of the year, patients were diagnosed as healthy or relapsed, as summarized in the table:
Prozac Placebo Total
Healthy 35 32 67
Replace 14 12 26
Total 49 44 93
Do these results provide evidence that Prozac might be helpful in treating anorexia? Explain.
Seventy-five percent of households say they woud feel secure if they had $50,000 in savings. You randomly select 8 households and ask them if they would feel secure if they had $50,000 in savings.
How many citizens would need to be sampled if a 99% confidence interval was desired to estimate the true proportion to within 1%?
What is the most conservative estimate of the sample size that would limit the margin of error to be within .05 of the population proportion for a 90%.
What is the probability that a randomly sampled battery of this type will last between 15 and 17 hours?
The least squares line for the data since year 1400 is shown on the graph. Is the slope of the line positive or negative? What does this imply?
Two percent of the parts from a production process are defective. A sample of five parts from the production process is selected. What is the probability that the sample contains exactly two defective parts?
Use the statistic of Exercise 12 to rework Exercise 70, and verify that the square of the value obtained for z equals the value obtained for χ2.
How would you use the "margin of error" in estimating the percentage of all adults who think that Venetian blinds are the hardest to clean?
An error with the release valve has caused the setting on the mint release machine to "shift". Assume that the machine shift is filling the bags with a mean weight of 11.56 ounces and a standard deviation of 0.05 ounces
In each of the following cases, the variable represents one way that a sample can be stratified in a study.
news reports tell us that the average american is overweight. many of us have tried to trim down to our weight when we
the u.s. post office is interested in estimating the mean weight of packages shipped using the overnight service. they
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