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The Journal of the American Medical Association reported on an experiment intended to see if the drug Prozac® could be used as a treatment for the eating disorder anorexia nervosa. The subjects, women being treated for anorexia, were randomly divided into two groups. Of the 49 who received Prozac, 35 were deemed healthy a year later, compared to 32 of the 44 who got the placebo.
a) Are the conditions for inference satisfied?
b) Find a 95% confidence interval for the difference in outcomes.
c) Use your confidence interval to explain whether you think Prozac is effective.
Find the equation of the least squares regression line that models the relationship between square footage and rental amount and interpret the meaning of the coefficients.
Determine the confidence interval for population mean and the Superintendent wants to determine the average amount of hours per week the student population studies at home.
If the population meanis to be estimated to within two days, with 95% confidence, how many outside salespeople should be sample.
The number of customers for a randomly selected week was collected. Should the vice president consider closing any of the stores based on daily patronage? Does a certain day of the week have any effect on the average number of customers
Radioactive decay. An experiment was conducted using a Geiger-Mueller tube in a physics lab. Geiger-Mueller tubes respond to gamma rays and to beta particles (electrons). A pulse that corresponds to each detection of a decay product is produced, a..
Determine standard normal area for each of the following: Standard normal area P(1.22
A successive independent survey design and a longitudinal survey design both examine changes in responses over time. How do they differ in their approach?
A woman working in telemarketing makes telephone calls to private homes according to a Poisson process with rate λ = 100 per (working) day. We estimate that the probability that she succeeds in selling her product, on a given call, is equal to 5%,..
Explain how you would use (a) simple random assignment and (b) matched random assignment to equalize your groups at the start of this study.
six second-graders tried tossing a ball into a basket ten times each. their teacher then suggested a different way of
you have three pieces of string with lengths of 42 inches 63 inches and 77 inches. you need to cut pieces of equal
Briefly describe how various economic factors can affect the equilibrium exchange rate of the Japanese yen's value with respect to that of the dollar.
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