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Because the "best fit" line is usually required to be a straight line, but the data

points are not all on one straight line. (If they were, then the best-fit line would

be a real no-brainer.)

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Q: Why does best fit line does not touch all data points?

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A scatter plot would be best for non-related data points. A line graph would be best for related data points.

If most of them lie below the line, then that line isn't the best fit. The exact layout depends on what definition you use for "best fit", but any definition will produce a line that has roughly the same number of data points on each side of it.

false

False

Yes. The exception arises when you have outliers.

Related questions

A scatter plot would be best for non-related data points. A line graph would be best for related data points.

A straight line which best describes the data on a scatter plot is called a "line of best fit". The line could pass through some of the points, all of them, or none of them.

Data points that are not close to the line of best fit are called outliers.

A best-fit line is the straight line which most accurately represents a set of data/points. It is defined as the line that is the smallest average distance from the data/points. Refer to the related links for an illustration of a best fit line.

a line of best fit

a line of best fit

a line of best fit

yes

line of best fit.

a line of best fit

False

a line drawn on a graph to reveal data points

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