4. The relationship between voltages applied to an electrical circuit and the current flowing is shown: Current(mA) 2 Voltage(V) Assuming a linear relationship, determine the equation of the regression line of voltage, 4 6 8 10 12 14 5 11 15 19 24 28 33 y of x correct to 4 significant figures. Plot the scatter diagram and draw the regression line. a) Determine (i) the voltage when the current is 3mA (ii) the current when the voltage is 40v, assuming the regression line is valid outside the data range. b) Calculate the correlation coefficient.
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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