4. IQ (as measured by the WAIS) is distributed in the general population as desc

Question

4. IQ (as measured by the WAIS) is distributed in the general population as described in (2a) above (mean of 100 standard deviation of 16). A sample of 25 Sagittarians are examined with a WAIS and score an average of 110. Suppose that they had been randomly selected from the general population. What's the probability the average think about the standard deviation of a sampling distribution here. Hint: You've got to use a table) (0 points) aa. L a..,,ha 11a vina. Var, ran take anv variahle that is answered "ves"

Explanation / Answer

Solution:

z = (X-Mean) / (SD/sqrt n)
z = (110 - 100) / (16/sqrt 25 = + 3.125
Required probability = P(X >/= 110)
= P(z >/= 3.125)
= 1 - P(z < 3.125
= 1 - 0.9991
= 0.0009

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