A population is estimated to have a standard deviation of 12. We want to estimate the population mean within 2, with a 95% level of confidence.
How large a sample is required? (Round up your answer to the next whole number.)
A population is estimated to have a standard deviation of 12. We want to estimate the...
A population is estimated to have a standard deviation of 12. We want to estimate the population mean within 2 with a 99 percent level of confidence. How large a sample is required?
A population is estimated to have a standard deviation of 10. We want to estimate the population mean within 2, with a 95% level of confidence. How large a sample is required? a. 98 b. 97 c. 96 d. 95
Consider a population having a standard deviation equal to 9.96. We wish to estimate the mean of this population. (a) How large a random sample is needed to construct a 95% confidence interval for the mean of this population with a margin of error equal to 1? (Round your answer to the next whole number.) The random sample is units. (b) Suppose that we now take a random sample of the size we have determined in part a. If we...
We want to estimate the population mean within 21, with a 90% level of confidence. The population standard deviation is estimated to be 60. How large a sample is required?
Please use excel for work. 20. We want to estimate the population mean within 5, with a 99% level of confidence. The population standard deviation is estimated to be 15. How large a sample is required?
you need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 150 days, with a standard deviation of 36 days. If you must estimate the population mean within 10 days, how many outside salespeople should you sample? Use the 95 percent confidence level. (Round up your answer to the next higher whole number.) Number of outside salespeople
The estimate of the population proportion is to be within plus or minus .05, with a 99 percent level of confidence. The best estimate of the population proportion is .12. How large a sample is required? (Round up your answer to the next whole number.) Sample size
Assume that you want to construct a 95% confidence interval estimate of a population mean. Find an estimate of the sample size needed to obtain the specified margin of error for the 95% confidence interval. The sample standard deviation is given below. Margin of error =$5,standard deviation=$25 The required sample size is ????? (Round up to the nearest whole number as needed.)
How large a sample should be taken if the population mean is to be estimated with 99% confidence to within $67? The population has a standard deviation of $893. (Round your answer up to the next whole number.) You may need to use the appropriate table in Appendix B to answer this question.
Assume that you want to construct a 95% confidence interval estimate of a population mean. Find an estimate of the sample size needed to obtain the specified margin of error for the 95% confidence interval. The sample standard deviation is given below. Margin of error equals=$66, standard deviation equals=$2222 The required sample size is _____. (Round up to the nearest whole number as needed.)