Astudy of one thousand teens found that the number of hours they spend on social networking sites each week is normally distributed with a mean of 15 hours. the population standard deviation is 2 hours. what is the 95% confidence interval for the mean?

The 95% confidence interval for the mean is between 14.88 hours to 15.12 hours.

Step-by-step explanation:

We have been given:

Sample size or n = 1000

Sample mean = 15 hours

Population standard deviation or s = 2 hours

We will use z distribution to find the confidence interval about the mean.

z value for 95% confidence interval is 1.96.

So, the interval is :

and

Solving this we get, 14.88 and 15.12

So, the 95% confidence interval for the mean is between 14.88 hours to 15.12 hours.

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step-by-step explanation:

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