8.5(d) Scatter Plot Trend Line Predictions

To make a prediction from a scatter plot it is beneficial to create trend line. The trend line is you best approximate for the middle of the data.

• Trend lines go through the middle of the all the points

• ...

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CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

In this example you can see the trend line in red intersect the 6 absences line at about 76. Therefore the actual point for 6 absences should be near or around 76, not necessarily exactly 76.

• So the actual point could be between 70-85 ish

• ...

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CCSS.HSA.CED.A.2

CCSS.HSA.REI.D.11

CCSS.HSS.ID.C.7

What exam score would you expect for a student with 6 absences?

• 92

• 78

• 69

• 55

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CCSS.HSS.ID.A.1

What would you expect the resting heart rate to be at 8 hours of weekly excercise?

• 62

• 50

• 40

• 39

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CCSS.HSA.CED.A.2

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

CCSS.HSS.ID.C.8

How many hours of recreational activity would you expect for someone who works 60 hours.

• 14

• 20

• 8

• 26

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CCSS.HSA.CED.A.1

CCSS.HSA.CED.A.2

CCSS.HSA.REI.D.10

CCSS.HSA.SSE.A.1

CCSS.HSS.ID.C.7

How many bowlers would you expect if a group rented 12 lanes?

• 90

• 78

• 61

• 55

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CCSS.HSA.CED.A.2

CCSS.HSA.REI.D.10

CCSS.HSS.ID.B.6

CCSS.HSS.ID.C.7

What's typing speed would you expect after 10 hours of learning?

• 24

• 30

• 15

• 35

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CCSS.HSA.CED.A.2

CCSS.HSA.REI.D.10

CCSS.HSS.ID.A.1

CCSS.HSS.ID.C.7

How much would you expect a family of 6 to spend on average?

• 150

• 200

• 240

• 125

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CCSS.HSS.ID.B.6

CCSS.HSS.MD.A.2

How many total dollars would you expect 10 people to spend?

• 130

• 150

• 110

• 100

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CCSS.HSA.CED.A.2

CCSS.HSS.ID.C.7

CCSS.HSS.MD.A.2

How many free throws are likely to be made if 60 are attempted?

• 35

• 50

• 20

• 70

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CCSS.HSS.ID.A.1

CCSS.HSS.MD.A.2

CCSS.HSS.MD.A.3