Scatter Plots & Trend Lines

When scatter plots demonstrate a linear relationship, a(n) ​ (a)   line can be used to show the general pattern of the data.

• straight

• points

• outlier

• association

• cluster

What is another term for trend line?

• Straight line

• Linear

• Line of Best Fit

How do I determine the y-intercept of the trend line from a graph?

• look where the line crosses the y-axis

• use the slope formula

Match the scatter plot to the equation that could represent the equation of its trend line.

• a. y = 3x

• b. y = 4x - 2

• c. y = -x + 5

• d. y = -5x

• e. y = -2x - 4

Match the scatter plot to the equation that could represent the equation of its trend line.

• a. y = 3x

• b. y = 4x - 2

• d. y = -5x

• e. y = -2x - 4

• f. y = x + 3

Match the scatter plot to the equation that could represent the equation of its trend line.

• a. y = 3x

• b. y = 4x - 2

• d. y = -5x

• e. y = -2x - 4

• f. y = x + 3

Which equation matches the trend line?

Use the scatter plot to mark each statement as true or false: The group of hikers descends about 250 feet every minute.

• True

• False; the hikers descend about 125 feet every minute.

• False; the hikers descend about 2500 feet every minute.

• False; the hikers descend about 200 feet every minute.

Use the scatter plot to mark each statement as true or false: The graph shows a negative association.

• True

• False; the graph shows a positive association.

• False; the graph shows no association between the variables.

Use the scatter plot to mark each statement as true or false: The scatter plot demonstrates a linear relationship.

• True

• False; the scatter plot demonstrates a non-linear relationship.

• False; the scatter plot shows no relationships at all.