In a study on the physical activity of young adults, pediatric researchers measu

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 =322 cpm and a standard deviation of =80 cpm. In a random sample of n=100 obese young adults, consider the sample mean counts per minute, -^x. (x overbar)

Describe the shape of the sampling distribution of -^x.

Explanation / Answer

as sample size is greater than 30 ; from central limit theorum we may assume that sampling distribution of xbar is normal with mean =322 and std error of mean =/(n)1/2 =80/(100)1/2 =8

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