Use the Following to Answer Questions

Multiple Choice

Use the following to answer questions :
The director of a radio broadcast company wants to determine whether the mean length of commercials on his station is equal to 24 seconds.A sample of 41 commercials had a mean life of 26.90 seconds and a standard deviation of 7.88 seconds.The significance level is 5%.
-What are the critical values of t?

A) -1.714 and 1.714
B) -1.684 and 1.684
C) -2.010 and 2.010
D) -2.021 and 2.021