(Solution) MATH225 Week 6 Assignment Confidence Interval for Mean – Population Standard Deviation Known

Question

Suppose the scores of a standardized test are normally distributed. If the population standard deviation is 4 points, what minimum sample size is needed to be 95% confident that the sample mean is within 1 point of the true population mean?

Use the table above for the z-score, and be sure to round up to the nearest integer.
Ans: 62

You can as well check out (Solution) MATH225 Week 6 Assignment Understanding Confidence Intervals – Excel

Question
Suppose the weights, in pounds, of the dogs in a city are normally distributed. If the population standard deviation is 3 pounds, what minimum sample size is needed to be 95% confident that the sample mean is within 1 pound of the true population mean?

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