Question 80846: not sure how to type this but here goes
Let a random sample be taken of size n = 100 from a population with known standard deviation of o = 20 . Suppose that the mean of the sample is X = 37 . The approximate 68% confidence interval for the mean, u , of the population from which the sample was drawn is
n = n
o = Population standard deviation
X = Sample mean
u = population mean
I need some help on this question and my key board is short some keys. I hope that you can help thank you mirna.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Let a random sample be taken of size n = 100 from a population with known standard deviation of o = 20 . Suppose that the mean of the sample is X = 37 . The approximate 68% confidence interval for the mean, u , of the population from which the sample was drawn is
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E=z*sgma/sqrt(n)
E=0.994*20/sqrt(100)
E=0.994*2
E=1.988
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CI: (x-bar-E,x-bar+E)
CI: (37-1.988, 37+1.988)
CI: (35.012,38.988)
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Let me know if this is too difficult to follow and I will add
some connecting comments.
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Cheers,
Stan H.
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