SOLUTION: 260 employees selected randomly from one company, 18.46 % of them commute by carpooling. Construct a 90% confidence interval for the true percentage of all employees of the compan

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Question 889642: 260 employees selected randomly from one company, 18.46 % of them commute by carpooling. Construct a 90% confidence interval for the true percentage of all employees of the company who carpool.
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
260 employees selected randomly from one company, 18.46 % of them commute by carpooling. Construct a 90% confidence interval for the true percentage of all employees of the company who carpool.
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sample proportion:: p-hat = 0.1846
ME = 1.645sqrt[0.1846*0.8156/400] = 0.0319
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90% CI:: 0.1846-0.0319 < p < 0.1846+0.0319
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90% CI:: 0.1527 < p < 0.2165
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Cheers,
Stan H.
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