Writing Equations for Scatter Plot Trend Lines

What is the main difference between writing an equation for a scatter plot trendline and a regular line?

• The scatter plot trendline is always a straight line.

• The scatter plot trendline requires estimating points.

• The scatter plot trendline uses different mathematical formulas.

• The scatter plot trendline does not require a y-intercept.

Why is it necessary to estimate the y-intercept on a scatter plot?

• Because the y-intercept is not important.

• Because the y-intercept is always a whole number.

• Because the y-intercept is always zero.

• Because the exact value is often not available.

What is the suggested strategy for choosing points to calculate the slope of a trendline?

• Choose points that are far apart.

• Choose points that are on the y-axis.

• Choose points that are on the x-axis.

• Choose points that are close together.

Why is it better to choose points far apart when calculating the slope?

• It avoids the need for estimation.

• It ensures the slope is always positive.

• It makes the calculation faster.

• It reduces the risk of a large margin of error.

What is the slope if the rise is 52 and the run is 110?

• 0.47

• 1.52

• 1.10

• 0.52

What is the equation of the trendline if the slope is 0.47 and the y-intercept is 13?

• y = 13x - 0.47

• y = 0.47x - 13

• y = 13x + 0.47

• y = 0.47x + 13

In the second example, what is the estimated y-intercept?

• 20

• 18

• 16

• 19

What is the rise if the y-intercept is 19 and the second point is at 0?

• 0

• 19

• -19

• 22.5

What is the run if the second point is at 23?

• 22.5

• 23

• 19

• 0

What is the equation of the trendline in the second example if the slope is -0.83 and the y-intercept is 19?

• y = -0.83x + 19

• y = 19x - 0.83

• y = -0.83x - 19

• y = 19x + 0.83