Suppose a researcher collects data on the gas mileage, measured in miles per gallon, for both city and highway driving in 35 cars. The data is plotted with city gas mileage on the horizontal axis and highway gas mileage on the vertical axis. The 1965 Triumph Herald is an outlier in the ?‑direction. What must be true about this car? A. This car is an influential observation. B. The highway gas mileage for this car is much higher or lower than other cars in the data set that have similar city gas mileage. C. The absolute value of the residual of this car is large. D. The city gas mileage for this car is much higher or lower than the rest of the cars in the data set. E. The highway gas mileage for this car is much higher or much lower than the rest of the cars in the data set.
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.
Suppose a researcher collects data on the gas mileage, measured in miles per gallon, for both city and highway driving in 35 cars. The data is plotted with city gas mileage on the horizontal axis and highway gas mileage on the vertical axis. The 1965 Triumph Herald is an outlier in the ?‑direction.
What must be true about this car?
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