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Q: Explain why high low line and regression line differs?
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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

Explain what a food web is and how it differs from a food chain?

a food web is when you have different varieties and it differs because a food chain is only a line

A point that is always on the regression line?

(mean x, mean y) is always on the regression line.

Why are there two regression lines?

There are two regression lines if there are two variables - one line for the regression of the first variable on the second and another line for the regression of the second variable on the first. If there are n variables you can have n*(n-1) regression lines. With the least squares method, the first of two line focuses on the vertical distance between the points and the regression line whereas the second focuses on the horizontal distances.

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

If the regression sum of squares is large relative to the error sum of squares is the regression equation useful for making predictions?

If the regression sum of squares is the explained sum of squares. That is, the sum of squares generated by the regression line. Then you would want the regression sum of squares to be as big as possible since, then the regression line would explain the dispersion of the data well. Alternatively, use the R^2 ratio, which is the ratio of the explained sum of squares to the total sum of squares. (which ranges from 0 to 1) and hence a large number (0.9) would be preferred to (0.2).

How do you solve regression line?

by regrsioning it.

Is the line of best fit the same as linear regression?

Linear Regression is a method to generate a "Line of Best fit" yes you can use it, but it depends on the data as to accuracy, standard deviation, etc. there are other types of regression like polynomial regression.

Are regression and trend line the same?


What is regression line?

Regression techniques are used to find the best relationship between two or more variables. Here, best is defined according to some statistical criteria. The regression line is the straight line or curve based on this relationship. The relationship need not be a straight line - it could be a curve. For example, the regression between many common variables in physics will follow the "inverse square law".

What is another name for the regression line?

It is often called the "Least Squares" line.

What is the line of regression?

line that measures the slope between dependent and independent variables