Population has a standard deviation
How large a sample must be taken if the population mean is to be estimated with 99% confidence to in $69? The population has a standard deviation of $908. (Round you answer up to the nearest whole number.)
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Compute the estimate for the standard error of difference between two independent means for s1^2 = 17, s2^2 = 10, n1 = 30, and n2 = 26. (Give your answer correct to two decimal places.)
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Calculate density function of length of time the machine functions. Find probability the machine lasts at least two years?
As the quality control expert,you want to determine the mean thickness of optical lenses produced by your firm. A sample of 120 lenses reveals the mean of .52 millimeter (mm).
A certain university admits only students scoring in top 25 percent of those taking the exam. What score does a student have to earn to be eligible for admission to that university?
Determine average rate of change in unit price of the tent if quantity demanded is between the given intervals. Find rate of change of unit price if quantity demanded is 5200?
The average weekly income of teachers is one school district is $390 with the standard deviation of $45. Determine the probability of a teacher earning more than $425 a week?
A local newspaper conducts a poll of 100 randomly selected adults to find out President Obama's job approval rating. A CNN/USA-Today study also conducts the poll of 1,010 randomly chosen adults. If his actual approval rating is 54%, which poll is
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