9.2 Lines of Best Fit

Select the statement that best describes the line.

• The line is the line of best fit.
• The line is NOT a line of best fit because it does not pass through two points.
• The line is NOT a line of best fit because it does not go through the middle of the data set.
• The line is NOT a line of best fit because it does not go through the origin.

Tags

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books.  Use the trend line to predict how many chapters would be in a book with 180 pages. 

• 12 chapters
• 15 chapters
• 18 chapters
• 21 chapters

Tags

CCSS.HSA.CED.A.2

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

The equation of the trend line
is  y= 1/2x +1
How many laps can a bicycle
make around the park in
23 minutes?    

• 44 laps
• 12 1/2 laps
• 23 laps

Tags

CCSS.HSA.CED.A.2

CCSS.HSA.REI.D.10

CCSS.HSA.SSE.A.1

CCSS.HSS.ID.C.7

The graph shows a line of best fit for data collected on the amount of income earned by lawn companies in relation to the number of yards mowed.  What is the equation of the line of best fit?

• y = (3/2) x
• y = 30x
• y = 30x + 300
• y = (3/2)x + 300

Tags

CCSS.HSA.CED.A.2

CCSS.HSS.ID.C.7

A teacher made the following graph showing absences vs. final grades.  Predict the grade of a student that has 7 absences.

• 45
• 50
• 60
• 70

Tags

CCSS.HSA.CED.A.2

CCSS.HSF.IF.B.4

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

The graph above shows a line of best fit for data collected on the distance bicyclists have remaining in relation to the amount of time they have been riding.  What is the equation of the line of best fit?

• y = -25x + 170
• y = 25x + 170
• y = -(5/8) x + 170
• y = (5/8) x + 170

Tags

CCSS.HSA.CED.A.2

CCSS.HSS.ID.C.7

A small theme park is trying to determine the number of guests they should expect on a weekend, based on the temperature outside.  Based on the trend line, about how many guests should be expected if the temperature is around 80°?

• 8,300
• 8
• 7,300
• 9,300

Tags

CCSS.HSA.CED.A.2

CCSS.HSF.IF.B.4

CCSS.HSF.IF.C.7

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

About how many male math teachers were there in 2006?

• 15
• 30
• 35
• 45

Tags

CCSS.8.SP.A.1

CCSS.8.SP.A.2

If the line of best fit is given, y = 31.45x - 242.3, where x represents hours and y represents income...

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

• $207.30

• $449.60

• $691.90

• $543.30

Tags

CCSS.HSA.REI.B.3

CCSS.HSA.SSE.A.1

CCSS.HSF.IF.A.1

CCSS.HSF.IF.A.2

The line of best fit for the height of a tree for various years after it was planted is

y = .96x + 8.47

Predict the height of a tree 30 years after it was planted.

• 22 feet

• 23 feet

• 36 feet

• 37 feet

Tags

CCSS.HSA.CED.A.2

CCSS.HSA.REI.B.3

CCSS.HSF.IF.A.1

CCSS.HSF.IF.A.2