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

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.
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Roosevelt Houghton
1.${H}_{0}:p=0.20$
${H}_{a}:p>0.20$
2. Assumed SRS. sample is less than 10% of population . (0.20)(22)<10 and (0.80)(22)>10