Did Americans work less than 40 hours week on average in 1973? In 1973, the GSS included questions regarding the number of hours that the respondent worked for each week. A sample of 30 respondents was questioned. The average number of hours worked per week was 39.49 hours with the standard deviation of 14.86 hours. Determine the test statistic?
A. -0.19
B. 0.426
C. -1.56
D. -0.034