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IQ test scores are standardized to produce a normal distribution with a mean of μ=100 and a standard deviation of σ=15 . Find the proportion of the population in each of the following IQ categories. a. Genius or near genius: IQ over 140 b. Very superior intelligence: IQ from 120 to 140 c. Average or normal intelligence: IQ from 90 to 109 | Numerade

SOLVED: IQ scores: Scores on an IQ test are normally distributed. Asample of 25 IQ scores had standard deviation s=8. The developer ofthe test claims that the population standard deviation is s=22. Dothese data provide sufficient evidence to contradict this claim?Use the a=0.10 level of significance.-State the appropriate null and alternate hypotheses.-Find the critical value. Round to at least 3 decimalplaces.-Compute the test statistic. Round to at least 3 decimalplaces.-Determine whether to r

SOLVED: Scores of an IQ test have bell shaped distribution with a mean of 100 and a standard deviation of 10 .

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