Question

16)You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately ? = 61.3 ? = 61.3 . You would like to be 95% confident that your estimate is within 2 of the true population mean. How large of a sample size is required? 17) You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately ? = 60.3 ? = 60.3 . You would like to be 99% confident that your estimate is within 0.1 of the true population mean. How large of a sample size is required? As in the reading, in your calculations: --Use z = 1.645 for a 90% confidence interval --Use z = 2 for a 95% confidence interval --Use z = 2.576 for a 99% confidence interval.

          16)You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately 
?
=
61.3
?
=
61.3
. You would like to be 95% confident that your estimate is within 2 of the true population mean. How large of a sample size is required?
17) You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately 
?
=
60.3
?
=
60.3
. You would like to be 99% confident that your estimate is within 0.1 of the true population mean. How large of a sample size is required? 

As in the reading, in your calculations:
--Use z = 1.645 for a 90% confidence interval
--Use z = 2 for a 95% confidence interval
--Use z = 2.576 for a 99% confidence interval.

Added by Jessie G.

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