SOLUTION: A random sample of 145 students is chosen from a population of 4,250 students. If the mean IQ in the sample is 130 with a standard deviation of 7, what is the 90% confidence interv

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Question 1010506: A random sample of 145 students is chosen from a population of 4,250 students. If the mean IQ in the sample is 130 with a standard deviation of 7, what is the 90% confidence interval for the students' mean IQ score?
98.98−101.02
109−112.
125−135
129.05−130.95

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A random sample of 145 students is chosen from a population of 4,250 students. If the mean IQ in the sample is 130 with a standard deviation of 7, what is the 90% confidence interval for the students' mean IQ score?
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x-bar = 130
ME = 1.645 * [7/ sqrt(145)] = 0.0794
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90% CI:: 130-0.0794 < u < 130+0.0794
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Cheers,
Stan H.
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129.05−130.95