The cost of a college 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 hours students work per week exceeds 20. To test this at a significance level of 0.05, a random sample of n = 20 students was selected and the following values were observed: Based on these sample data, the critical value expressed in hours:
A) is approximately equal to 25.26 hours.
B) is approximately equal to 25.0 hours.
C) cannot be determined without knowing the population standard deviation.
D) is approximately 22 hours.

Question

The cost of a college 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 hours students work per week exceeds 20. To test this at a significance level of 0.05, a random sample of n = 20 students was selected and the following values were observed:  Based on these sample data, the critical value expressed in hours:
A) is approximately equal to 25.26 hours. 
B) is approximately equal to 25.0 hours. 
C) cannot be determined without knowing the population standard deviation. 
D) is approximately 22 hours.

Quizplus · Accepted Answer

The Answer of The cost of a college 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 hours students work per week exceeds 20. To test this at a significance level of 0.05, a random sample of n = 20 students was selected and the following values were observed:  Based on these sample data, the critical value expressed in hours:
A) is approximately equal to 25.26 hours. 
B) is approximately equal to 25.0 hours. 
C) cannot be determined without knowing the population standard deviation. 
D) is approximately 22 hours.

The Cost of a College Education Has Increased at a Much