We have a data set which contains the speed of cars and the distances taken to stop. Note that the data were recorded in the 1920s. We know the following summary statistics of the data: n=50 ∑xi=770, ∑x2i=13228 ∑ni=1yi=2149, ∑y2i=124903 ∑xiyi=38482 1(a). Calculate the estimated Pearson's correlation coefficient. Test the hypothesis ρ=0, what is the value of T statistics? 1(b). Calculate the least squares estimates of the slope and intercept. 1(c). Use the fitted linear model to obtain the fitted value of the distance taken to stop if the speed car is 15
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.
We have a data set which contains the speed of cars and the distances taken to stop. Note that the data were recorded in the 1920s. We know the following summary statistics of the data:
n=50
∑xi=770, ∑x2i=13228
∑ni=1yi=2149, ∑y2i=124903
∑xiyi=38482
1(a).
Calculate the estimated Pearson's
Test the hypothesis ρ=0, what is the value of T statistics?
1(b). Calculate the least squares estimates of the slope and intercept.
1(c). Use the fitted linear model to obtain the fitted value of the distance taken to stop if the speed car is 15.
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