Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018
18th Edition
ISBN: 9780079039897
Author: Carter
Publisher: McGraw Hill
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Concept explainers

Correlation
Correlation defines a relationship between two independent variables. It tells the degree to which variables move in relation to each other. When two sets of data are related to each other, there is a correlation between them.
Linear Correlation
A correlation is used to determine the relationships between numerical and categorical variables. In other words, it is an indicator of how things are connected to one another. The correlation analysis is the study of how variables are related.
Regression Analysis
Regression analysis is a statistical method in which it estimates the relationship between a dependent variable and one or more independent variable. In simple terms dependent variable is called as outcome variable and independent variable is called as p…
Question

A national consumer magazine reported the following correlations.

  • The correlation between car weight and car reliability is -0.6.
  • The correlation between car weight and annual maintenance cost is 0.4.

According to this information, which of the following statements are true?

I. Heavier cars tend to be less reliable. 
II. Heavier cars tend to cost more to maintain. 
III. Car weight is related more strongly to reliability than to maintenance cost.

  • I only
  • II only
  • III only
  • I and II
  • I, II, and III
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