A.9 Line and Curve of Best Fit Guided practice

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

Tags

CCSS.8.EE.B.5

About how many male math teachers were there in 2006?

• 15
• 30
• 35
• 45

Tags

CCSS.HSF.LE.B.5

What type of correlation does this scatter plot show?

• positive 
• negative
• no correlation
• nonlinear association

Tags

CCSS.HSF-LE.A.1B

What is the equation of the line of best fit?

• y = -25x + 170

• y = -5/8x + 170

• y = 25x + 170

• y = 5/8x + 170

Tags

CCSS.8.EE.B.5

Use the line of best fit to approximate rate of change relative to the scatter plot above.

• 7/5

• 5/7

• -7/5

• -5/7

Tags

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

The table shows the height of a tree for various years after it was planted. Using the line of best fit, how tall would the tree be 30 years after it was planted?

• 22 feet

• 23 feet

• 36 feet

• 37 feet

Tags

CCSS.HSF.LE.B.5

find line of best fit using calculator through these points (0,0)(1,2) (3,5) (6,7)

• y=65x+7

• y=1.14x+.64

• y=1.5x+64

Tags

CCSS.HSA.CED.A.2

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

A scientist dropped an object from a height of 200 feet. She recorded the height of the object in 0.5-second intervals. Her data is shown.

Based on a quadratic model, which best approximates the height at 3 seconds?

• 52 feet

• 55 feet

• 65 feet

• 80 feet

Tags

CCSS.HSA.CED.A.2

CCSS.HSA.REI.B.4

CCSS.HSA.SSE.A.1

CCSS.HSF.IF.B.4

Which equation best represents this data set?
 $\left\{\left(-4,-4.8\right),\left(-3,-8.2\right),\ \left(-2,-9.1\right),\left(-1,-8.1\right),\ \left(0,\ -4.7\right),\ \left(1,\ 0.3\right)\right\}$  

•  $y=1.1x^2+4.2x+4.9$  

•  $y=1.1x^2+4.2x-4.9$  

•  $y=1.1x-4.2$  

•  $y=1.1x+4.2$  

Tags

CCSS.HSA.CED.A.2

Using the equation of the line of best fit, which number is the best prediction of the output when the input is 13?
 $\left\{\left(-5,\ 9\right),\ \left(2,\ 31\right),\ \left(9,\ 143\right),\ \left(11,\ 151\right),\ \left(0,\ 42\right),\ \left(5,\ 97\right)\right\}$  

• 127

• 159

• 170

• 178