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.
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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.
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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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