Automobile mechanics conduct diagnostic tests on 150 new cars of a particular make and model to determine the extent to which they are affected by a recent recall due to faulty catalytic converters. They find that 42 of the new cars tested do have faulty catalytic converters. The 99% confidence interval for the true proportion of new cars with faulty catalytic converters is .

99% Confidence interval: (0.185,0.375)                                                  

Step-by-step explanation:

We are given the following in the question:

Sample size, n = 150

Number of cars that have faulty catalytic converters, x = 42

99% Confidence interval:

Putting the values, we get:

The 99% confidence interval for the true proportion of new cars with faulty catalytic converters is (0.185,0.375)

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step-by-step explanation

2r= 2300

r =1150

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