a. What are the independent and dependent variables? b. Draw a scatter plot. c. Use regression to find the line of best fit and the correlation coefficient.
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.
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a.
Dependent and independent variable:
The variable of interest, regarding which, the prediction is being made, is the dependent or response variable; the variable which explains the variation in the response variable is the independent or predictor variable or explanatory variable.
Here, the prediction is made regarding the variable, PCINC and the independent variable is the year.
That is, dependent variable- PCINC
Independent variable -Year
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