Bivariate Data

A scatter plot was created to show the length of a person's vacation and the weight of the suitcase they packed. The equation of the trend line is y=5x+15, where x represents the length of the trip. Use the equation to predict the weight of a suitcase for someone taking a 9-day trip.

• 45

• 60

• 15

• 55

A line drawn on a scatter plot that is close to most of the data points.

• Best fitting line

• Best Linear Line

• Line of best fit

What is a line of best fit used for?

• To predict things

• To have a better understanding of the graph

• To connect the points

• To make you look smart

If a line of best fit models the data very well, what would you expect to see in a graph of the data and the line?

• The line connects a lot of the points.

• The line is underneath all the points.

• The line is non-linear.

• The line is close to all the points.

What is the trend for this scatter plot

• Negative

• Positive

• None

• A) y = 1.4x + 55
• B) y = 1.4x - 84
• C) y = 0.72x + 60
• D) y = 0.72x + 56

• y = 1.45x + 22
• y = -2x + 15
• y = 1.33x + 30
• y = -1.5x + 24

Using the points (6,70) & (9,95), what is the line of best fit equation?

• y = 8.3 x + 20

• y = -8.3 x + 20

• y = 8.3 x + 60

• y = -8.3 x + 60

• A
• B
• C
• D

What relationship is shown in the scatter plot?

• As the cost goes down, the number sold goes down.

• As the cost goes up, the number sold goes down.

• As the cost goes down, the number sold remains the same.

• There is not relationship between cost and the number sold.