A simple random sample of 50 speeds (in mph) is obtained from cars traveling on the section of I-10 through Tallahassee. The sample has mean of 72.3 mph and standard deviation of 7.4 mph. Employ a 0.05 significance level to test the claim that the mean speed of all cars is greater than the posted speed limit of 70 mph.
Based upon the above condition calculate the value of the test statistic
-2.198
2.198
4.156
325.269