Confidence interval for the mean
A confidence interval for the price of gasoline from a random sample of 40 gas stations in a region gives the statistics below.
y= $4.49, s=$0.27
Find the 90% confidence interval for the mean.
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The following data was collected to determine whether or not Monroe County College students work 18 hours per week:
A confidence interval for price of gasoline from the random sample of 40 gas stations in region gives the statistics below.
A researcher tested both brands of medicine on two groups of randomly chosen patients. The results of test are given in the following table. The mean and standard deviation of relief times are in minutes.
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