Question: Scores on an IQ test are normally distributed. A sample of 25 IQ scores had standard deviation s = 8. The developer of the test

Scores on an IQ test are normally distributed.

A sample of 25 IQ scores had standard deviation s = 8.

The developer of the test claims that the population standard deviation is σ = 15.

Do these data provide sufficient evidence to contradict this claim? Use the α = 0.05 level of significance.

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