you want to estimate the mean time college students spend watching online videos each day. the estimate must be within 1 minute of the population mean. determine the required sample size to construct a 99% confidence interval for the population mean. assume the population standard deviation is 2.4 minutes.

The required sample size is 39.

Step-by-step explanation:

We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:

Now, we have to find z in the Ztable as such z has a pvalue of .

That is z with a pvalue of , so Z = 2.575.

Now, find the margin of error M as such

In which is the standard deviation of the population and n is the size of the sample.

Minimum sample size, within 1 minute of the population mean, population standar deviation of 2.4 minutes.

This minimum sample size is given by n, which is found when , and we have that . So

Rounding up

The required sample size is 39.

y/x=18

step-by-step explanation: