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

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Nallasivam V
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Sep 6, 2016

#### Answer:

Population Mean lies between

#### Explanation:

Given -

Sample Mean

Sample size

Population SD

Confidence interval

Population Mean

#SE=sigma/sqrtn=15/1000=0.015#

Critical Value of

#mu=15+-(1.96 xx 0.015)#

#mu=15+-0.0294#

Upper Limit

#mu=15+0.0294=15.0294#

Lower Limit

#mu=15-0.0294=14.9706#

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