Free Printable Line of Best Fit

1.

What is the purpose of a line of best fit?

a)

To go through every point

b)

To make predictions about the data

c)

To go through none of the points

d)

To tell you absolutely everything about a data set

2.

True or false: This graph represents the line of best fit for the data.

a)

True

b)

False

3.

Which graph shows the line of best fit?

a)

A

b)

B

c)

C

d)

D

4.

Based on the scatterplot, predict how many would be in a book with 180 pages.

a)

12

b)

16

c)

18

d)

20

5.

Based on the scatterplot, predict how many hours you would have to work to earn $400.

a)

15 hours

b)

25 hours

c)

35 hours

d)

45 hours

6.

Based on the scatterplot, predict how many turtles there would be after 15 months.

a)

125

b)

150

c)

175

d)

200

7.

What equation do you put in demos to find your a and b values?

a)

$y=ax+b$

b)

$y\sim a_1x+b_1$

c)

$y\sim ax+b$

d)

$y_1\sim ax_1+b$

8.

Use desmos to find the equation for the line of best fit for this data.

a)

$y=0.37x+3.68$

b)

$y=3.68x+0.37$

c)

$y=0.84x+0.92$

d)

$y=0.92x+0.84$

9.

The data table represents the number of days it was a certain temperature. The line of best fit for this data is $y=0.37x+3.68$ . Use desmos to figure out how many days it will be 100 degrees.

a)

4.05 days

b)

260.32 days

c)

373.68 days

d)

40.68 days

10.

Use your line of best fit equation to determine what the temperature will be for 20 days.

a)

11.28 degrees

b)

4.42 degrees

c)

44.12 degrees

d)

20.17 degrees

Line of Best Fit

Total questions: 10

Worksheet time: 50mins

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