Alzheimer's disease. For a sample of n = 9 patients, the scores for the 7-Minute Screen averaged M = 7 with SS = 92. The cognitive test scores averaged M = 17 with SS = 236. For these data, SP = 127. a. Find the regression equation for predicting the cognitive scores from the 7-Minute Screen score. b. What percentage of variance in the cognitive scores is accounted for by the regression equation? C. Does the regression equation account for a sig- nificant portion of the variance in the cognitive scores? Use a = .05 to evaluate the F-ratio. I|
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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