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A pharmaceutical firm, studying the selection of "name brand" versus "generic equivalent" on prescription forms, has been given a sample of 150 recent prescriptions submitted to a local pharmacy. Of the 44 under-40 patients in the sample, 16 submitted a prescription form with the "generic equivalent" box checked.
Of the 52 patients in the 40-60 age group, 28 submitted a prescription form specifying "generic equivalent," and for the 54 patients in the 61-or-over age group, 32 submitted a prescription form specifying "generic equivalent."
At the 0.025 level, is age group independent of name-brand/generic specification? Based on the chi-square table, what is the most accurate statement that can be made about the p-value for the test?
What sample size would be needed for an error of ± 1.5 with 98 percent confidence? (Data are from a project by MBA student Wendy Blomquist.)
q1. in a city in italy 30 of the families have a mastercard 20 have an american express card and 25 have a visa card.
Let Y denote the number of weeks in the year in which no orders are received.- What kind of random variable is Y? Explain.- What is the expected number of weeks with no orders?
The accompanying sample consisting of n 5 20 observations on dielectric breakdown voltage of a piece of epoxy resin appeared in the article "Maximum Likelihood Estimation in the 3Parameter Weibull Distribution (IEEE Trans. on Dielectrics and Elec..
Suppose two random variables X and Y are both zero mean and unit variance.- Determine under what conditions on the constants a, b, c and d the random variables W and Z are uncorrelated.
using the information provided indicate which statistical test you think should be used for each of the following
The probability that an airplane passenger misses his/her fight is only .05. A typical airplane has 100 seats. If all the tickets are sold: a) What is the probability that all the passengers make it to the flight?
The average body temperature for healthy adults is 98.6° F. Is this statement true? Do all healthy people have exactly the same body temperature? A study was conducted a few years go to examine this belief.
A 12 ounce bottle of beer has 355 ml. The Random Brewing Company sets its machinery so that the contents of a bottle is normally distributed with a mean of 355.5 ml and a standard deviation of 1 ml. (The contents of a bottle are also independent from..
You want to know how the commuting time of your employees compare to Departments competing for the same staff, so you get some survey data on average commuting times for36 randomly selected people in your line of business.
In what way are the quota sample and the stratified sample similar? In what way are they different? What effect does this difference have on the applications for which such samples might be appropriate?
A sample of 20 pages was taken without replacement from the 1,591-page phone directory Ameritech Pages Plus Yellow Pages.
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