Scatterplots, Trend Lines, & Predictions

Identify the association of the scatter plot shown.

• Positive

• Negative

• No Association

• Undefined

Identify the association of the scatter plot shown.

• Linear

• Non-Linear

• No Association

• Undefined

Identify the outlier of the scatter plot shown.

Use the trend line to predict the score a student will likely earn on their History test if they spend 30 minutes studying.

• 5%

• 60%

• 70%

Use the trend line to predict the amount of time a student should plan to study if their goal is to earn a score of 80% on their History test.

• 36 minutes

• 42 minutes

• 48 minutes

• Who studies for tests?

The scatter plot shown represents the outside low temperature in degrees Fahrenheit and the number of hot chocolates sold at a concession stand during a football season. What does the y-intercept for the equation of the line of best fit represent in the context of the situation?

• The temperature when 0 hot chocolates are sold.

• The number of hot chocolates sold on a day with a low of 0 degrees Fahrenheit.

• The change in the number of hot chocolates sold per degree.

• The change in the degrees per hot chocolate sold.

The scatter plot shown represents the outside low temperature in degrees Fahrenheit and the number of hot chocolates sold at a concession stand during a football season. What does the slope for the equation of the line of best fit represent in the context of the situation?

• The temperature when 0 hot chocolates are sold.

• The number of hot chocolates sold on a day with a low of 0 degrees Fahrenheit.

• The change in the number of hot chocolates sold per degree.

• The change in the degrees per hot chocolate sold.

What is the BEST equation to match the line of best fit?

y == (a)   x +​ ​ (b)  

• -5
• 380
• 10
• 360
• -20
• 400
• 1
• -1

Use the equation y=-5x+380 to determine how many hot chocolates they can expect to sell at the concession stand on a day with a low temperature of 45 degrees Fahrenheit.

x = Low Temperature (degrees Fahrenheit)

y = Number of Hot Chocolates Sold

• 155 hot chocolates

• 125 hot chocolates

• 275 hot chocolates

• 67 hot chocolates

Use the equation y=-5x+380 to determine what the low temperature will likely be on a day where 100 hot chocolates are sold.

x = Low Temperature (degrees Fahrenheit)

y = Number of Hot Chocolates Sold