Find the standard deviation for the sample proportion

Reference no: EM13126091

"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."
Q1 = What is the standard deviation for the sample proportion? a.) 0.11 b.) 0.021 c.)0.031 d.) .021
"What is the probablily that in this group over 18% of the new cars will be found to have electrical problems?"

Reference no: EM13126091

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