Answered: The image contains two graphs typical…

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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Question

The image contains two graphs typical of the analysis of a simple linear regression model. It can be stated that:

a. The variance of the errors seems constant

b. The errors do not come from a normal distribution

c. The linear model does not seem appropriate

d. The residuals are close to the line and therefore there is normality in the data.

Explain crearly the answer please, thanks

Sample Quantiles
100
50
0
-50
Normal Q-Q Plot
00
oooooo
-1 0 1
Theoretical Quantiles
Predichos
Figura 1:
250
150
0 50
Residuales vs predichos
O
O
-50
0
buil
50
Residuales
100

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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