Question

In order to estimate the average time spent on the computer terminals per student at a local university, data were collected from a sample of 81 business students over a one-week period. Assume the population standard deviation is 1.2 hours. The standard error of the mean is_______.

a. 7.5
b. 0.014
c. 0.160
d. 0.133

Answer 1

d. 0.133

Explanation:

-Standard error is calculated using the formula:

`E=(\sigma)/(√(n))\\\\\sigma-=standard \ deviation\\n=sample \ size`

#We substitute the given values in the formula to solve for E:

`E=(\sigma)/(√(n))\\\\=(1.2)/(√(81))\\\\=0.133`

Hence, the standard error is 0.133 and the correct option is d