Answered: Individuals with a condition known as…

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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Individuals with a condition known as “prosopagnosia” cannot recognize faces. Their perceptual abilities are intact, and they can accurately describe features such as eye color, size of the nose, and shape of the mouth. They can even tell you whether someone is attractive. However, they cannot recognize anyone’s face, not even the faces of their friends and family. Dr. Joseph DeGutis has been conducting research and trying to develop a training regimen that would allow patients with prosopagnosia to improve their recognition abilities. Patients complete a battery of perceptual tests to determine their baseline performance (a pre-test) and then are trained for six days on a facial categorization task. They are tested again (a post-test) to determine their levels of improvement.

Would it be valid for Dr. DeGutis to use the independent-measures t test to test whether the training leads to an improvement?

No, because Dr. DeGutis is using a repeated-measures (within-subjects) research design. In this type of design, the study populations are not independent.

Yes, if his sample size is ≥30 or the raw scores are normally distributed.

No, because he does not have homogeneity of variance.

Yes.

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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