Determine the population mean
A population is estimated to have standard deviation of 20. We want to determine the population mean in 5, with 95% level of confidence. How large of sample is needed?
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A statistics professor receives average of five email messages per day from students. Suppose the number of messages approximates a poisson distrivution.
Does the market for shared workspace likely possess characteristics of a perfectly competitive market? Explain. Recently, competitors of Plug and Play have been opening their own shared- workspace centers.
After arriving at universtity students medical clinic, the waiting times to receive service after checking - in follow exponential distrivution with mean of 12 minutes. Compute the probability a student waits less than 13 minutes.
The american auto association reports mean price per gallon of regular gasoline is $2.10 with population standard deviation of $0.20. Suppose a random sample of 36 gasoline stations is chosen and their mean cost for regular gasoline is computed.
Determine the formulas for the mean and the standard deviation for the distribution of sample means?
A manufacturer has two factories which make watches, A and B. Defective watches are made 1 out of 100 times in A, and 1 out of 200 times in B. A retailer gets a large box of watches shipped from one of such factories
As a part of its testing program, longlast tests sample of 144 batteries. What percentage of samples will have a mean useful life less than 68 months?
Calculate the mean of the distribution of the sample means and the poulation mean. Compare the two values. What is true about the two values?
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