The Welcher Intelligence Test Scale is composed of a number of subtests. On one subtest, the raw scores have a mean of 45 and a standard deviation of 7. Assuming these raw scores form a normal distribution: What number represents the 65th percentile (what number separates the lower 65% of the distribution)? What number represents the 90th percentile? What is the percentage of getting a raw score between 28 and 38? What is the percentage of getting a raw score between 41 and 44?

given data normal distributionμ = 45σ = 7

Answered: The Welcher Intelligence Test Scale is…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The Welcher Intelligence Test Scale is composed of a number of subtests. On one subtest, the raw scores have a mean of 45 and a standard deviation of 7. Assuming these raw scores form a normal distribution:

What number represents the 65^th percentile (what number separates the lower 65% of the distribution)?

What number represents the 90^th percentile?

What is the percentage of getting a raw score between 28 and 38?

What is the percentage of getting a raw score between 41 and 44?

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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