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The national freshman-to-sophomore retention rate has held steady at 74%. A certain college has 486 of the 610 freshman return as sophomores. Does this college have a right to brag that it has an unusually high retention rate?
in a manufacturing process a random sample of 49 bolts manufactured has a mean length of 1.67 inches with a standard
1. a random sample of 26 offshore oil workers took part in a simulated escape exercise and their times sec to complete
In an experiment on a new drug to determine the most effective dosage and method of administration, subjects were randomly assigned to either 5, 10, 15, or 20 mg of the active drug.
The EPA will grant a tax credit if the city-highway mileage estimate is at least 31 mpg
1. the total cholesterol levels of a sample of men aged 35-44 are normally distributed with a mean of 206 milligrams
What is the shape of the distribution daily sales revenue from telemarketing operations and what is an estimate of the expected daily sales revenue from telemarketing operations?
in a recent survey 72 of the community favored building a health center in their neighborhood. if 14 citizens are
a process is said to be of six-sigma quality if the process mean is at least six standard deviations from the nearest
for the following which type of t-test is required?a studying the effects of a memory drug on alzheimers patients
a newspaper finds that the mean number of typographical errors per page is four. find the probability that more than
the rapid test is used to determine whether someone has hiv the virus that causes aids. the false-positive and
A mean time of 90 minutes and standard deviation of 18 minutes. What proportion of new typists need between 1 and 2 hours to learn the computer system?
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