Question: Scores on an IQ test are normally distributed. A sample of 20 IQ scores had standard deviation= s 10 . (a) Construct a90 % confidence

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

20

IQ scores had standard deviation=

s

10

.

(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=

11

. Does this confidence interval contradict this claim? Explain.

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