SOLUTION: Qustion: A survey of 950 car owners found that 28% of the cars are named Lexus. Find the 99% confidence interval of the true proportion of cars named Lexus.
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Question 387159: Qustion: A survey of 950 car owners found that 28% of the cars are named Lexus. Find the 99% confidence interval of the true proportion of cars named Lexus. Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website! A survey of 950 car owners found that 28% of the cars are named Lexus. Find the 99% confidence interval of the true proportion of cars named Lexus.
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p-hat = 0.28
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ME = z*sqrt[pq/n]
= 2.5758*sqrt[0.28*0.72/950]
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= 0.0375
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99% CI: 0.28-0.0375 < p < 0.28+0.0375
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99% CI: 0.2425 < p < 0.3175
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Cheers,
Stan H.
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