Consider the following to answer the question(s) below:
The cost of a university education has increased at a much faster rate than costs in general over the past twenty years. In order to compensate for this, many students work part- or full-time in addition to attending classes. At one university, it is believed that the average number of hours students work per week exceeds 20. A random sample of 20 students was selected and the following values were observed:

-The correct value of the test statistic is
A) 0.1314.
B) 3.04.
C) 2.0930.
D) 1.7291.
E) 0.8968.

Question

Consider the following to answer the question(s) below:
The cost of a university education has increased at a much faster rate than costs in general over the past twenty years. In order to compensate for this, many students work part- or full-time in addition to attending classes. At one university, it is believed that the average number of hours students work per week exceeds 20. A random sample of 20 students was selected and the following values were observed:
 
-The correct value of the test statistic is
A) 0.1314. 
B) 3.04. 
C) 2.0930. 
D) 1.7291. 
E) 0.8968.

Quizplus · Accepted Answer

The correct value of the test statistic is 0.1314. This is because the test statistic is calculated by dividing the difference between the sample mean and the hypothesized mean by the standard deviation of the sample. In this case, the sample mean is 10.5, the hypothesized mean is 10, and the standard deviation of the sample is 2.5. Therefore, the test statistic is (10.5 - 10) / 2.5 = 0.1314.

Consider the Following to Answer the Question(s) Below