You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 43.9. You would like to be 99% confident that your estimate is within 1.5 of the true population mean. How large of a sample size is required?

You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o = 61.5 dollars. You would like to be 90% confident that your estimate is within 1.5 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? n =

You take a random sample of n = 900 observations from a population with a mean of 100 and a standard deviation of 10. What's the largest value of x you would expect to find?       A. 108  B. 101  C. 100  D. 110

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 77.8. You would like to be 90% confident that your estimate is within 4 points of the true population mean. How large of a sample size is required? n = Submit Question

You want to obtain a sample to estimate how much parents spend on their kids birthday parties. Based on previous study, you believe the population standard deviation is approximately o 69.8 dollars. You would like to be 90% confident that your estimate is within 3 dollar(s) of average spending on the birthday parties. How many parents do you have to sample? n= Submit Question

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 74.3. You would like to be 98% confident that your estimate is within 3 of the true population mean. How large of a sample size is required? Round up to nearest whole number. n =

We want to obtain a sample to estimate a population mean. Based on previous evidence, researchers believe the population standard deviation is approximately �=76.5. We would like to be 90% confident that the estimate is within 2.5 of the true population mean. How large of a sample size is required?n = ___

A  Find the standard error of the mean for each sampling situation (assuming a normal population).  (Round your answers to two decimal places). 1.  O=56, n=4 2. O=56, n=16 3.  O=56, n=64 B.  What happens to the standard error each time you quadruple the sample size? The standard error is ________ by half.

You want to estimate the average weight in tons of loads carried by trucks through a particular stretch of road. From previous information the standard deviation is expected to be o-13.5 tons. How many trucks must be weighed to estimate the the tons per truck to within 5 tons at a 90% level of confidence. Round your answer up to the largest whole number. n= trucks

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately o = 22.3. You would like to be 98% confident that your estimate is within 3 of the true population mean. How large of a sample size is required? Do not round mid-calculation. n =