6. Cross tabulations Problem: The following crosstabulation shows household income by educational level of the head of household (Statistical Abstract of the United States: 2008) Household Income ($1000s) Under 25 25.0- 49.9 50.0- 74.9 75.0- 99.9 100 or Educational Level more Total Not H.S. graduate H.S. graduate Some college 1,389 5,027 4,678 2 848 4,207 3,459 6,850 5,258 2 094 539 2,637 3,250 2 581 367 2,668 4,074 5 379 9,961 22,099 20,067 13 787 4.917 2,807 885 Bachelor's deoree

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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 predictors. Regression analysis is one of the methods to find the trends in data. The independent variable used in Regression analysis is named Predictor variable. It offers data of an associated dependent variable regarding a particular outcome.