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I have a sample of 31 7thgrade girls who took an IQ test.  I calculated the sample...

I have a sample of 31 7thgrade girls who took an IQ test.  I calculated the sample mean to be 105.84 and the sample standard deviation to be 14.27. Calculate a 95% CI for the mean.

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Answer #1

n = 31

sample mean = 105.84

s = 14.27

t-score for 95% confidence interval = t0.025,30 = 2.042

Confidence interval

                              

                              

                               = (100.606 , 111.074)

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