A Professor Would Like to Test the Hypothesis That the Average

Multiple Choice

A professor would like to test the hypothesis that the average number of minutes that a student needs to complete a statistics exam is equal to 45 minutes. A random sample of 40 students was selected and the number of minutes needed to complete the exam was recorded. Assume that the standard deviation for the population of students taking the exam is 5.7 minutes and the true population mean for taking an exam is 45.8 minutes. Using α = 0.05, beta equals ________.

A) 0.4215
B) 0.6670
C) 0.1987
D) 0.8577