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

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Question 82
Multiple Choice
arrowQuestion 82arrow
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 σ=15\sigma = 15 Do these data provide sufficient evidence to contradict this claim? Use the α=0.05\alpha = 0.05 level of significance.


A) Reject H0.H _ { 0 } .
The population standard deviation appears to differ from 15 .
B) Do not reject H0H _ { 0 }
There is insufficient evidence to conclude that the population standard deviation differs from 15 .

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