Question

# A company with a fleet of 150 cars found that the emissions systems of 7 out of the 22 they tested failed

Probability
A company with a fleet of 150 cars found that the emissions systems of 7 out of the 22 they tested failed to meet pollution control guidelines.
Is this strong evidence that more than 20% of the fleet might be out of compliance?
Test an appropriate hypothesis and state your conclusion.
Be sure the appropriate assumptions and conditions are satisfied before you proceed.

1.$$\displaystyle{H}_{{0}}:{p}={0.20}$$
$$\displaystyle{H}_{{a}}:{p}{>}{0.20}$$