Did Americans work less than 40 hours a week on average in 1973? In 1973, the GSS included questions about the number of hours that the respondent worked per week. A sample of 30 respondents was questioned. The average number of hours worked per week was 39.49 hours with a standard deviation of 14.86 hours. What is the test statistic? Group of answer choices -1.56 0.426 -0.19 -0.034

The test statistic is -0.19.

Step-by-step explanation:

We are given that in 1973, the GSS included questions about the number of hours that the respondent worked per week. A sample of 30 respondents was questioned. The average number of hours worked per week was 39.49 hours with a standard deviation of 14.86 hours.

We have to test the hypothesis that did Americans work less than 40 hours a week on average in 1973 or not.

Let Null Hypothesis, : 40 hours  {means that Americans work greater than or equal to 40 hours a week on average in 1973}

Alternate Hypothesis, : < 40 hours  {means that Americans work less than 40 hours a week on average in 1973}

The test statistics that will be used here is One-sample t-test ;

             T.S. =  ~

where, = sample average number of hours worked per week = 39.49

              = sample standard deviation = 14.86 hours

             n = sample of respondents = 30

              = population mean

SO, test statistics =   ~

                             = -0.19

Therefore, the value of test statistic is -0.19.

that is the sum

step-by-step explanation:

there are no other answers without knowing the variables values

a

step-by-step explanation:

the answer is a