Question 138210: Help, I can not figure out how to get the confidence interval for a t distribution. I really need step by step instructions.
For example if my sample mean is 2266.333, my standard deviation is 229.109, a random sample of 12 persons, find a 95% confidence interval for the mean number of miles driven. I can't figure this out, help
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! For example if my sample mean is 2266.333, my standard deviation is 229.109, a random sample of 12 persons, find a 95% confidence interval for the mean number of miles driven.
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x-bar = 1166.333
E = t
t* for 95% confidence and df = 12-1 is 2.179
E = 2.179 = 144.115
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95% CI: 1166.333-144.115 < u < 1166.333+144.115
95% CI: 1022.218 < u < 1310.448
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Cheers,
Stan H.
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