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The random error in a regression equation?
includes both positive and negative terms.
The regression equation is determined by minimizing?
The total squared error between the predicted y values and the actual y values
Do you need more than 10 observations in linear regression?
This is a difficult question to answer. The pure answer is no. In reality, it depends on the level of randomness in the data. If you plot the data, it will give you an idea of the randomness. Even with 10 data points, 1 or 2 outliers can significantly change the regression equation. I am not aware of a rule of thumb on the minimum number of data points. Obviously, the more the better. Also, calculate the correlation coefficient. Be sure to follow the rules of regression. See the following website: http:/www.duke.edu/~rnau/testing.htm
Regression analysis is a statistical procedure for developing a mathematical equation that describes how?
one dependent and one or more independent variables are related.
What should you use to find the equation for a line of fit for a scatter plot?
Least squares regression is one of several statistical techniques that could be applied.
What is the adjective of the word regression?
of, pertaining to, or determined by regression analysis: regression curve; regression equation. dictionary.com
What is the only condition under which (x y) regression equation solved for x gives the same predictions as the (y x) regression equation?
If the regression is a perfect fit.
What is regression coefficient and correlation coefficient?
The strength of the linear relationship between the two variables in the regression equation is the correlation coefficient, r, and is always a value between -1 and 1, inclusive. The regression coefficient is the slope of the line of the regression equation.
Given a linear regression equation of equals 20 - 1.5x where will the point 3 15.5 fall with respect to the regression line?
on the lineGiven a linear regression equation of = 20 - 1.5x, where will the point (3, 15) fall with respect to the regression line?Below the line
What does a regression equation look like?
It can look like any algebraic equation.
Is there any relation between regression and linear equation?
Yes.
Explain the concept of correlation and regression line as a forecasting tool?
once an equation for a regression is derived it can be used to predict possible future
Is the random error in a regression equation the predicted error?
pig benis
Is the regression equation a mathematical equation that defines the relationship between two variables?
No. It is an estimated equation that defines the best linear relationship between two variables (or their transforms). If the two variables, x and y were the coordinates of a circle, for example, any method for calculating the regression equation would fail hopelessly.
The random error in a regression equation?
includes both positive and negative terms.
The value 11.7 represents the of the graph of the following linear regression equation?
slope
When a pair of variables have a positive correlation will the slope in the regression equation always be positive?
Yes
