Answered: The image contains two graphs typical…

Algebra & Trigonometry with Analytic Geometry

13th Edition

ISBN:9781133382119

Author:Swokowski

Publisher:Swokowski

Chapter1: Fundamental Concepts Of Algebra

Section1.4: Fractional Expressions

Problem 7E

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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.

Why? Thanks

Sample Quantiles
100
50
0
-50
Normal Q-Q Plot
Pooooooo
-1 0
Theoretical Quantiles
Predichos
250
150
0 50
Residuales vs predichos
O
00
O
-50 0 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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