Answered: Suppose reaction times for recognition…

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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Suppose reaction times for recognition of common words like red or green are normally distributed with μμ=220 milliseconds and σσ=32. A psychologist presents a sample of n=16 participants with words that include the names of colors. However, the color names are printed in a different color of ink. That is, the word red might be printed in blue ink, or green might be printed in red. For these words, the sample had a mean reaction time of M=240.

a. Do these data indicate that presenting color names in another color changes reaction time? Use a two tailed test with αα=.05.

b. Compute Cohen's d to measure the size of the treatment effect.

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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