Introductory Statistics
Introductory Statistics
1st Edition
ISBN: 9781938168208
Author: Barbara Illowsky, Susan Dean
Publisher: OpenStax College
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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…
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Chapter 13, Problem 48P

Use the following information to answer the next five exercises. Two coworkers commute from the same building. They are

interested in whether or not there is any variation in the time it takes them to drive to work. They each record their times for

20 commutes. The first worker’s times have a variance of 12.1. The second worker’s times have a variance of 16.9. The first

worker thinks that he is more consistent with his commute times. Test the claim at the 10% level. Assume that commute

times are normally distributed.

What is n?

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Chapter 13 Solutions

Introductory Statistics

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