An 1Q test is designed so that the mean is 100 and the standard deviation is 19 for the population of normal adults. Find the sample size necessary to estimate the mean 1Q score of statistics students...

Extracted text: An 1Q test is designed so that the mean is 100 and the standard deviation is 19 for the population of normal adults. Find the sample size necessary to estimate the mean 1Q score of statistics students such that it can be said with 90% confidence that the sample mean is within 8 IQ points of the true mean. Assume that a = 19 and determine the required sample size using technology. Then determine if this is a reasonable sample size for a real world calculation. The required sample size is 15. (Round up to the nearest integer.)