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Get Full Access to Statistics: Informed Decisions Using Data - 5 Edition - Chapter 7 - Problem 11
Get Full Access to Statistics: Informed Decisions Using Data - 5 Edition - Chapter 7 - Problem 11

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# ?Wechsler Intelligence Scale The Wechsler Intelligence Scale for Children is approximately normally distributed, with mean 100 and standard deviation 1 ISBN: 9780134133539 240

## Solution for problem 11 Chapter 7

Statistics: Informed Decisions Using Data | 5th Edition

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Problem 11

Wechsler Intelligence Scale The Wechsler Intelligence Scale for Children is approximately normally distributed, with mean 100 and standard deviation 15.

(a) What is the probability that a randomly selected test taker will score above 125?

(b) What is the probability that a randomly selected test taker will score below 90?

(c) What proportion of test takers will score between 110 and 140?

(d) If a child is randomly selected, what is the probability that she scores above 150?

(e) What intelligence score will place a child in the 98th percentile?

(f) If normal intelligence is defined as scoring in the middle 95% of all test takers, figure out the scores that differentiate normal intelligence from abnormal intelligence.

Step-by-Step Solution:

Step 1 of 5) Wechsler Intelligence Scale The Wechsler Intelligence Scale for Children is approximately normally distributed, with a mean of 100 and a standard deviation of 15. (a) What is the probability that a randomly selected test taker will score above 125 (b) What is the probability that a randomly selected test taker will score below 90 (c) What proportion of test-takers will score between 110 and 140 (d) If a child is randomly selected, what is the probability that she scores above 150 (e) What intelligence score will place a child in the 98th percentile (f) If normal intelligence is defined as scoring in the middle 95% of all test takers, figure out the scores that differentiate normal intelligence from abnormal intelligence.

Step 2 of 2

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Statistics: Informed Decisions Using Data : Estimating a Population Proportion
?A ____________ is the value of a statistic that estimates the value of a parameter.

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