Did Americans work less than 40 hours a week on average in 1

Did Americans work less than 40 hours a week on average in 1984? In 1984, the GSS included questions about the number of hours that the respondent worked per week. The average number of hours worked per week was 36.63 hours with a standard deviation of 13.23 hours. A sample of 34 respondents was questioned. Find the test statistic.

ANSWER CHOICES:

Solution

Test Statistic
Population Mean(U)=40
Sample X(Mean)=36.63
Standard Deviation(S.D)=13.23
Number (n)=34
we use Test Statistic (t) = x-U/(s.d/Sqrt(n))
to =36.63-40/(13.23/Sqrt(33))
to =-1.49