Question

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

Probability
ANSWERED
asked 2021-08-17
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.

Expert Answers (1)

2021-08-18
1.\(\displaystyle{H}_{{0}}:{p}={0.20}\)
\(\displaystyle{H}_{{a}}:{p}{>}{0.20}\)
2. Assumed SRS. sample is less than 10% of population . (0.20)(22)<10 and (0.80)(22)>10
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