Answered: Let us revisit the hypothetical study…

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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Topic Video

Question

Question # 15.

Let us revisit the hypothetical study discussed earlier in the section in which consumers are asked

to rate a company both before and after viewing a video on the company twice a day for a week.

Use an alpha of 0.05 to test to determine whether there is a significant increase in the rating of the

company after the 0ne-week video treatment. Assume that difference in ratings are normally

distributed in the population.

# 1 2 3 4 5 6 7

Before 32 11 21 17 30 38 14

After 39 15 35 13 41 39 22

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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