angeldr
Forum Newbie
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The intelligence quotient (IQ) scores are obtained for a sample of 100 patients diagnosed with various types of schizophrenia who completed a standard IQ test battery. An additional 20 patients had to be dropped from the sample because they lacked the functional capacity to complete two or more portions of the test. Four other patients refused to take the test battery when offered the opportunity. Results for the patients who completed the test battery gave an average IQ of 110 and a standard deviation of 20.
Using this information, compute the 95% confidence interval for this estimate of the mean.
A. 70 to 130
B. 70 to 150
C. 85 to 115
D. 90 to 130
E. 105 to 115
F. 106 to 114
hi friends. i just have one confusion for this whats the sample size (n) in this que we should consider? can u ans and explain? thanks.
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| angeldr
Forum Newbie
Topics: 5
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anyone??
!!
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| Tiff
Forum Guru
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It seems like they started with a sample of 124 and ended up with 100 because it clearly states that 100 patients completed the battery of the IQ tests. So that simply can't include the people who didnt...like the 20 who couldn't do all portions and the 4 who refused. So I would just work with the sample size of 100 which only makes sense to me.
Mean is 110
SD is 20
SD/sqrt N = 20/(sqrt100) = 2
CI = Mean +/- (2 x SD/sqrtN) = 110 +/- (2x2)
Choice F 106 to 114
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| pr20
Forum Senior
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You are right Tiff.
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| angeldr
Forum Newbie
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hi tiff..
thanks for the ans.i think i missed that !! i thought 24 people out of 100 didnt finish the study. so then it became confusion.
but now its fine.thanks for pointing out.
cyou n gud luck
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| Ig F
Forum Elite
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Posts: 439
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 yeah its F.....106-114
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