SOLUTION: A school social worker wishes to estimate the mean amount of time each week that high school students spend with friends. She obtains a random sample of 1175 high school students a

Question 223767: A school social worker wishes to estimate the mean amount of time each week that high school students spend with friends. She obtains a random sample of 1175 high school students and finds that the mean weekly time spend with friends is 9.2 hours. Assuming the population standard deviation amount of time soend with friends is 6.7 hours, construct and interpret a 90% confidence interval for the mean time spent with friends each week
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
A school social worker wishes to estimate the mean amount of time each week that high school students spend with friends.
She obtains a random sample of 1175 high school students and finds that the mean weekly time spent with friends is 9.2 hours.
Assuming the population standard deviation amount of time spent with friends is 6.7 hours, construct and interpret a 90% confidence interval for the mean time spent with friends each week.
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sample mean = 9.2 hrs
standard error = E = 1.645*6.7/sqrt(1175) = 0.3215
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90% CI: 9.2-0.3215 < u < 9.2+0.3215
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Cheers,
Stan H.

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