Line of Best Fit and Trend Lines

Presentation

•

Mathematics

•

7th Grade

•

Hard

Joseph Anderson

FREE Resource

9 Slides • 8 Questions

Scatterplots and Trend Lines

8th Grade

What is a Trend Line?

When data is collected, points do not form a straight line, but they may approximate to a linear relationship

A trend line is a line that is

VERY CLOSE to most of the data points.

It is used to make conjectures (predictions)

Multiple Choice

What is a trend line used for?

To make predictions

To make the graph look pretty

To connect the points

First, Lets make a trend line!

- Count the number of points, make a line that best fits the data points.

TIP: Count the number of total points. Try to have the same number of points on both sides of the trend line

Make a Prediction!

How many visitors would the beach have at 90 degrees?

Make a prediction!

What will the weight of the shipment be for 7 books?

Multiple Choice

Which graph shows a line of best fit (trend line) for the scatter plot?

Graph A

Graph B

Graph C

Graph D

Multiple Choice

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

Multiple Choice

Based on the scatterplot, what is the best prediction of the average number of hours a person spends at work every week, if that person spends an average of 10 hours on recreational activities every week?

33 hours

85 hours

50 hours

65 hours

Multiple Choice

Based on the scatterplot, what is the best prediction of the average amount of money spent on groceries for a household of 7 people?

$240

$190

$210

$300

The following questions are for you to do independently...

Multiple Choice

Based on the trend in the data, approximately how many free throws would a player be expected to make if he attempted 60 free throws?

Multiple Choice

Based on this scatterplot, approximately what score would a student with 6 absences expect to receive on the final exam?

Multiple Choice

Based on the scatterplot, about how much money would a group of 10 people be expected to spend on food and beverages at this restaurant?

$135

$115

$105

$150

Scatterplots and Trend Lines

8th Grade

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