John finds r=-.60 between the variable of number of hours studied (X) and number of errors on a statistics test (Y). He also finds r= +.30 between the variables of size of the classroom (X) and number of errors on the test (Y). (a) describe the relative shapes of the two scatterplots (b) describe the relative amount of variability in Y scores at each X in each study (c) describe the relative closeness of Y scores to the regression line in each study
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.
John finds r=-.60 between the variable of number of hours studied (X) and number of errors on a statistics test (Y). He also finds r= +.30 between the variables of size of the classroom (X) and number of errors on the test (Y).
(a) describe the relative shapes of the two scatterplots
(b) describe the relative amount of variability in Y scores at each X in each study
(c) describe the relative closeness of Y scores to the regression line in each study
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