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.

goog may be able to you find that answer

part a

x     y

0     8

1     7.5

2     7

3     6.5

4     6

5     5.5  

for every hour i deducted .5 inches from the length of the candle

part b

it is a function because for every x value there is only one y value

part   c

for every x value there is only one y value

x       y

0       8

1       7.6

2       7.2

3       6.8

step-by-step explanation: