A group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time student
s spent studying per week. Assuming a population standard deviation of six hours, what is the required sample size if the error should be less than a half hour with a 95% level of confidence?
Given that a group of statistics students decided to conduct a survey at their university to find the average (mean) amount of time students spent studying per week.
population standard deviation
Std error =
Margin of error for 95%
=
Since sample size is number of items it cannot be indecimal.
So we can round off to the next high integer on a safer side.