A researcher was interested in studying Americans email habi

A researcher was interested in studying Americans email habits. She suspected that Americans spend less than 7 hours a week answering their email.The General Social Survey in 2004 included a question that asked about the number of hours that the respondent spend on email per week. The General Social Survey in 2002 asked 1,264 respondents this question. The sample mean number of hours was 6.02 and the sample standard deviation was 7.80. Find the test statistic.

Solution

Test Statistic
Population Mean(U)=7
Sample X(Mean)=6.02
Standard Deviation(S.D)=7.8
Number (n)=1264
we use Test Statistic (t) = x-U/(s.d/Sqrt(n))
to =6.02-7/(7.8/Sqrt(1263))
to =-4.47

ANS: