The Cost of a College Education Has Increased at a Much

Multiple Choice

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.