In a sample of 200 households, the mean number of hours spent on social networking sites during the month of January was 55 hours. In a much larger study, the standard deviation was determined to be 7 hours. Assume the population standard deviation is the same. What is the 99% confidence interval for the mean hours devoted to social networking in January?

The 99% confidence interval ranges from 53.73 to 56.27 hours.
The 99% confidence interval ranges from 7 to 55 hours.
The 99% confidence interval ranges from 54.51 to 55.49.
The 99% confidence interval ranges from 55 to 60 hours.

Question

In a sample of 200 households, the mean number of hours spent on social networking sites during the month of January was 55 hours. In a much larger study, the standard deviation was determined to be 7 hours. Assume the population standard deviation is the same. What is the 99% confidence interval for the mean hours devoted to social networking in January?

 The 99% confidence interval ranges from 53.73 to 56.27 hours.
 The 99% confidence interval ranges from 7 to 55 hours.
 The 99% confidence interval ranges from 54.51 to 55.49.
 The 99% confidence interval ranges from 55 to 60 hours.

anonymous · Answer

@Loser66

loser66 · Answer

hehehe... @lovingod786  I don't know how to solve it. I am sorry. :)

anonymous · Answer

I seen this a minute ago and I can help later. I blanked out on part of it but I have a book at home that will fill my blank but cannot get to it right now :-) I am at work :-(

anonymous · Answer

I had to do this in my statistic class. I am just having a brain fart right now and need my book from home to spray some air freshener around lol

anonymous · Answer

Lol thats funnny

anonymous · Answer

didi you found the answer ?