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Scores on an IQ test are normally distributed. A sample of12 IQ scores had standard deviation= s 7 . (a) Construct a90 % confidence interval

Scores on an IQ test are normally distributed. A sample of12

IQ scores had standard deviation=

(a) Construct a90

confidence interval for the population standard deviation

.Round the answers to at least two decimal places.

(b) The developer of the test claims that the population standard deviation is=

. Does this confidence interval contradict this

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