11.18_19 Unit 8 Lines of Best Fit

Dropdown

The data has​ ​

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association. ​

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When scatter plots demonstrate a ​

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relationship, a ​

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line can be used to show the general pattern of the data.

A ​

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line, or "line of best fit", is a ​straight line that should lie as close as possible to the ​

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of data in the scatter plot.

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linear

straight

trend

points

associations

equations

functions

curved

Match

Match the correct description to the correct scatter plot and trend line.

no, trend line is negative

yes

no, trend line is too high

no, trend line is too low

• no, trend line is negative

• yes

• no, trend line is too high

• no, trend line is too low

Drag and Drop

Writing Equations of Trend Lines

1. Choose any two points on the trend line and set up a ratio of rise/run to find the ​

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of the line, or "m".

2.Look at the y-axis to find the ​ ​

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of the line, or "b".

3.Use these to write an equation in slope-intercept form:​ y = ​

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x + ​

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b

m

x

y

z

x-intercept

slope

y-intercept

Math Response

Write an equation in slope-intercept form for the trend line.

Type answer here

Correct Answer: y=-\frac{1}{3}x+8

Deg^°

Rad

Draw

Circle the graph that shows the best line of fit for the data set.

Hotspot

Select the graph that show the best trend line.

Multiple Choice

Which equation represents the line of best fit for the data in the scatter plot?

• $$y=x+9$$

• $$y=-x-9$$

• $$y=-x+9$$

• $$y=x-9$$

Multiple Choice

Exit Ticket:

Which equation represents the line of best fit for the data in the scatter plot?

• $$y=-2x+1$$

• $$y=2x+1$$

• $$y=2x-1$$

• $$y=2x+9$$