Question

Social networking websites such as facebook and twitter have a contributed to an increase in time spent on the internet. Last year, a study conducted by nileson company indicates that the average America facebook user spends a mean of 7 hours per month on the facebook site. If a recent sample of 64 randomly selected American Facebook users average 8.1 hours for the month on the facebook site, can one conclude that monthly average has increased this year? use mean=7 hours, standard error (SE) =0.8 and alpha =1%  

Answer 1

H0: = 7.

Ha: > 7

Test statistics

t = - / SE

= 8.1 - 7 / 0.8

= 1.38

This is test statistics value.

Critical value at 0.01 level with 63 df = 2.387

Since test statistics falls in non-rejection region , we fo not have sufficient evidence to reject H0.

We conclude at 0.01 level that we fail to support the claim.