Calculating Line of Best Fit

Line of Best Fit

By Scott Donnelly

Multiple Choice

What is the correlation?

• Positive

• Negative

• No Correlation

Multiple Choice

What is the correlation?

• Positive

• Negative

• No Correlation

Line of Best Fit

Line that best represents the scatter plot.

If there is a positive correlation, then your line of best fit should have a positive slope.

If there is a negative correlation, then your line of best fit has a negative slope.

If there is no correlation, then there is no line of best fit.​

Next Slide

Copy down steps on next slide into composition book.

​Drawing lines of Best Fit

1. Determine the correlation if there is one.

2. Draw line that represents scatter plot, line should be bet​ween as many as possible.

3. The line should be able to predict the next point or any point.​

Open Ended

Why is the line of best fit here incorrect?

Open Ended

Why is the line of best fit here correct?

Multiple Choice

What is the correlation of the scatter plot?

• Positive

• Negative

• No Correlation

Multiple Choice

Can you draw a line of best fit?

• Yes

• No

Multiple Choice

Which line is line of best fit for the data?

Draw

Draw a line of best fit.

Next Slide

Copy down steps on next slide into composition book.

​Determine equation

Writing equation of line of best fit.

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​Example

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Multiple Choice

Which scatter plot would use $$y=\frac{1}{2}x+2$$   as line of best fit?

Draw

Draw a line of best fit and then write equation for the line.

Draw

Using your equation from last slide, how many pounds overweight would someone who spends 8 hours per day on computer be?