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

d. 0.133

Step-by-step explanation:

-Standard error is  calculated using the formula:

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

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

for any of you who need the translation here it is

step-by-step explanation:

find the angular size of the equatorial radius of the earth, if the horizontal parallax of the sun

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step-by-step explanation: