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Chapter 9: Problem 5

On most modern IQ tests, a score of 115 would be: A. about normal. B. about \(15 \%\) higher than the average of one's agemates. C. an indication of genius. D. one standard deviation above the mean.

Short Answer

Expert verified
A. The score is about normal. B. The score is 15% higher than the average. C. The individual is a genius. D. The score is one standard deviation above the mean. Answer: B, D

Step by step solution

01

Calculate how much higher the given score is from the mean

First, let's find out how much higher the score of 115 is compared to the mean score of 100. We can do this by subtracting the mean from the given score: $$115 - 100 = 15$$
02

Determine as a percentage how much higher the score is from the mean

To calculate this percentage, divide the difference we found in Step 1 by the mean and multiply the result by 100: $$ \frac{15}{100} \times 100 = 15 \% $$
03

Compare the difference to the standard deviation

Next, we need to determine how many standard deviations the given score is above the mean. Divide the difference we found in Step 1 by the standard deviation (15): $$ \frac{15}{15} = 1 $$ The given score is one standard deviation above the mean.
04

Select the correct answer

Now we can analyze the provided options: A. The given score is 15% higher than the average, so "about normal" isn't accurate. B. We calculated the score is 15% higher than the average, so this statement is true. C. A score of 115 doesn't represent genius-level intelligence, so this is false. D. Our calculations showed one standard deviation above the mean, so this statement is true. Therefore, the correct answer choices are B and D.

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Most popular questions from this chapter

Most school districts consider children who _______ to be gifted. A. have IQ scores above 115 B. score in the upper \(2 \%-3 \%\) of the IQ distribution C. have parents in professional careers D. demonstrate high levels of leadership and creativity

IQ tests have proven to be good predictors of: A. social intelligence. B. practical problem-solving intelligence. C. school performance. D. all of the above.

If a test has good test-retest reliability: A. there is a strong correlation between items on the test. B. it accurately measures what it says it measures. \(\mathrm{C}\). it can be used to predict future performance. D. the test yields similar scores if taken at two different times.

Which of the following is a likely consequence of stereotype vulnerability for members of minority groups? A. Academic motivation declines. B. Academic performance often suffers. C. Standardized tests may be especially anxiety arousing. D. All of the above are likely consequences.

Which of the following does not belong with the others? A. aptitude tests C. intelligence tests B. personality tests D. achievement tests
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