Highway transportation officials are trying to determine if the average speed on Archer road is above 45mph, the post speed limit. They took a sample of 50 cars. The sample mean was 44.9 and the standard deviation was 10. Find the test statistic.0.010.0707-0.01-0.0707

Option D) -0.0707

Explanation:

We are given the following in the question:  

Population mean, μ = 45 mp

Sample mean, = 44.9

Sample size, n = 50

Sample standard deviation, s = 10

Formula:

Putting all the values, we have

Thus, the test statistic is

Option D) -0.0707

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y