Scores on an IQ Test Are Normally Distributed $\sigma = 15$

question 62

Multiple Choice

Scores on an IQ test are normally distributed. A sample of 19 IQ scores had standard deviation s=9 . The developer of the test claims that the population standard deviation is $\sigma = 15$ Do these data provide sufficient evidence to contradict this claim? Use the $\alpha = 0.05$ level of significance.

• A) Reject \(H _ { 0 } .\)
• The population standard deviation appears to differ from 15 .
• B) Do not reject \(H _ { 0 }\)
• There is insufficient evidence to conclude that the population standard deviation differs from 15 .

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