Question

A study of three hundred teenagers found that the number of hours they spend on instant messaging sites each week is normally distributed with a mean of 13 hours. The population standard deviation is 5 hours. What is the margin of error for a 99% confidence interval?

0.745

0.334

0.320

0.413

I think it is the second one.

Answer 1

@phi Save me a gain

Answer 2

if im incorrect what is the formula im supposed to be plugging into?

Answer 3

@shamil98

Answer 4

@Jamierox4ev3r

Answer 5

@Directrix

Answer 6

Yeah Shamil's here

Answer 7

To be honest with you, I do not know how to approach this question, sorry.

Answer 8

@Hero

Answer 9

I know that the margin of error in the mean is calculated as \[error_{s} = \frac{s}{\sqrt{N}}\] Where s is the standard deviation and N is the total sample size.