Line of Best Fit and Association

What is a line of best fit used for?

• To make predictions

• To make the graph look pretty

• To connect the points

• To make it look like you know what you are doing

What type of association does this graph have?

• positive 

• negative

• none

• all of the above

Determine the predicted income if 22 hours were worked on an assembly job.

• $207.30

• $449.60

• $691.90

• $543.30

Tags

CCSS.HSF.LE.B.5

What does the value, r= -0.89, tell us about the linear relationship of two quantitative variables?

• Strong positive

• Weak positive

• Strong negative

• Weak negative

Tags

CCSS.HSF-LE.A.1B

Which of the following lines represents the line of best fit for the scatter plot?

• A

• B

• C

• D

Tags

CCSS.8.EE.B.5

Is the line a good fit for the data in the scatterplot?

• There are an equal number of data points above and below the line, so the line is a good fit.

• There are an equal number of data points above and below the line, but the line does not follow the trend, so it is not a good fit.

• There is no relationship between x and y, so the line is not a good fit.

• There is a non-linear association between the x and y values, so the line is not a good fit.

Is this line an accurate line estimate of best fit for the data?

• Yes

• No

• y = 1.45x + 22
• y = -2x + 15
• y = 1.33x + 30
• y = -1.5x + 24

Tags

CCSS.8.EE.B.5

What is the equation of the line of best fit?

• y= 6x + 2

• y = -2x +6

Tags

CCSS.8.EE.B.5

Is this line an accurate line estimate of best fit for the data?

• Yes

• No

Tags

CCSS.8.EE.B.5