Year of Birth 1920 1930 1940 1950 1960 1970 1980 1990 Life Expectancy (years) 54.1 59.7 62.9 68.2 69.7 70.8 73.7 75.4
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.
Table gives life expectancies for people born in the United States in the given years. (a) Determine the least squares approximating line for these data and use it to predict the life expectancy of someone born in 2000. (b) How good is this model? Explain.
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