1. It is generally believed that electrical problems affect about 14% of new cars. An
automobile mechanic conducts diagnostic tests on 128 new cars on the lot.
a. Describe the sampling distribution for the sample proportion by naming the model and
telling its mean and standard deviation. Justify your answer.
b. Sketch and clearly label the model.
c. What is the probability that in this group over 18% of the new cars will be found to have
electrical problems?

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The Answer of 1. It is generally believed that electrical problems affect about 14% of new cars. An
automobile mechanic conducts diagnostic tests on 128 new cars on the lot.
a. Describe the sampling distribution for the sample proportion by naming the model and
telling its mean and standard deviation. Justify your answer.
b. Sketch and clearly label the model.
c. What is the probability that in this group over 18% of the new cars will be found to have
electrical problems?

1 It Is Generally Believed That Electrical Problems Affect About