If you want to be 95​% confident of estimating the population mean to within a sampling error of ±2 and the standard deviation is assumed to be 17​, what sample size is​ required?   ​(Round up to the nearest​ integer.)

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 74.4. You would like to be 90% confident that your estimate is within 4 of the true population mean. How large of a sample size is required? n=

A marketing specialist wants to estimate the average amount spent by visitors to an online retailer's newly-designed website. From the data in a preliminary study she guesses that the standard deviation of the amount spent is about 14 dollars. Question 1. How large a sample should she take to estimate the mean amount spent to within 5 dollars with 95% confidence? (Round your answer up to the next largest integer).

f you want to be 99​% confident of estimating the population proportion to within a sampling error of ±0.05 and there is historical evidence that the population proportion is approximately 0.42​, what sample size is​ needed?

On average, a sample of n = 36 scores will provide a better estimate of the population mean than a sample of n = 49 scores from the same population.

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=51.3. You would like to be 98% confident that your estimate is within 10 of the true population mean. How large of a sample size is required?

You want to obtain a sample to estimate a population mean age. Based on previous evidence, you believe the population standard deviation is approximately o = 2.3 years. You would like to be 95% confident that your estimate is within 0.75 years of the true population mean. What is the smallest sample size you can use? The smallest possible sample has members.

If you want to be 95% confident of estimating the population mean to within a sampling error of ±3 and the standard deviation is assumed to be 17, what sample size is required? The sample size required is. (Round up to the nearest integer.)

Executives at a car dealership want to estimate the average age of their customers before making a television commercial. They want to be 90% confident that the mean age is ±2 years of the sample mean. If the standard deviation from a previous study is 12 years, how large should the sample be? 98 ODD 239 4 139

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the standard deviation is approximately s=24.3s=24.3. You would like to be 90% confident that your esimate is within 2 of the true population mean. How large of a sample size is required? Show your work.