Answer (Choose 1 answer)
A B C An article stated that students in FPT university system take an average of 4.5 years to finish their undergraduate degrees. Suppose you believe that the average time is longer. You conduct a survey of 49 students and obtain a sample mean of 5.1 with a sample standard deviation of 1.2. Assume that time to finish their undergraduate degrees is normally distributed. Calculate the value of the test statistic and the critical values for this test statistic. Use a significance level of 0.05.
20.05 =1.645, 20.025 1.96, 0.05,48 = 1.677, 0.025,48 = 2.011
A. Test statistic: -3.5 and critical value: -2.011
B. None of the other choices is correct
C. Test statistic: 3.5 and critical value: 1.96
D. Test statistic: -3.5 and critical value: -1.645
E. Test statistic: 3.5 and critical value: 1.677
Let
Exit 25
