Answer to Question #65297 in Statistics and Probability for Demetrius Miles

Question

In a study on the physical activity of young​ adults, pediatric researchers measured overall physical activity as the total number of registered movements​ (counts) over a period of time and then computed the number of counts per minute​ (cpm) for each subject. The study revealed that the overall physical activity of obese young adults has a mean of mu equals 325μ=325 cpm and a standard deviation of sigma equals 90σ=90 cpm. In a random sample of n equals 100n=100 obese young​ adults, consider the sample mean counts per​ minute, x overbarx.

1. mu bar-x =

Answer 1

mu_{x bar} = mu = 325 cpm
S_{x bar} = sigma/ sqrt(n) = 90/sqrt(100) = 9 cpm