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Our client asked us to compute a 97% confidence interval for the time it takes to build a house in Kamloops. There are 32 observations in our sample. The sample mean is 60 days.
a) What is the 99% confidence interval, if the population standard deviation is known to be 10 days?
b) What is the 99% confidence interval, if the sample standard deviation is 10 days
c) Find the 80% confidence interval, if the population standard deviation is known to be 10 days.
A scientist wants a confidence interval of 90% and a margin of error of +-2 for a mean of a Normal population with σ =10. What size samples should she take?
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