Slope and Predictions in Scatterplots for 8th Graders

A scatterplot shows the relationship between hours studied and test scores. If the line of best fit has a slope of 3, what does this mean in terms of test scores for each additional hour studied?

• For each additional hour studied, the test score increases by 1 point.

• For each additional hour studied, the test score increases by 3 points.

• For each additional hour studied, the test score decreases by 3 points.

• For each additional hour studied, the test score remains the same.

In a scatterplot of temperature vs. ice cream sales, the line of best fit has a slope of 5. If the temperature is 80 degrees, predict the ice cream sales if the y-intercept is 20.

• 500

• 100

• 420

• 300

A scatterplot shows the number of hours worked and weekly earnings. If the line of best fit has a slope of 15 and the y-intercept is 100, how much will someone earn if they work 10 hours?

• 200

• 250

• 150

• 300

The scatterplot of car speed vs. fuel efficiency shows a line of best fit with a slope of -2. What does this indicate about the relationship between speed and fuel efficiency?

• There is a negative relationship between speed and fuel efficiency.

• There is a positive relationship between speed and fuel efficiency.

• Speed has no effect on fuel efficiency.

• Higher speed leads to better fuel efficiency.

A scatterplot indicates that for every 2 units of increase in the independent variable, the dependent variable increases by 6 units. What is the slope of the line of best fit?

• 3

• 5

• 4

• 2

Using a scatterplot of rainfall vs. crop yield, the line of best fit has a slope of 4. If the rainfall increases by 3 inches, how much can we predict the crop yield will increase?

• 8 units

• 10 units

• 12 units

• 6 units

A scatterplot shows the relationship between age and height in children. If the line of best fit has a slope of 2.5, how much taller can we expect a child to grow as they age by 4 years?

• 5

• 15

• 10

• 8

In a scatterplot of hours of exercise vs. weight loss, the line of best fit has a slope of -1. If a person exercises for 5 hours, how much weight can they expect to lose?

• 5 units

• 0 units

• 10 units

• 2 units

A scatterplot shows the relationship between the number of books read and the score on a reading comprehension test. If the slope of the line of best fit is 4, how much will the test score increase for each additional book read?

• 10

• 6

• 2

• 4

The scatterplot of advertising budget vs. sales revenue shows a line of best fit with a slope of 10. If a company increases its advertising budget by $500, how much additional revenue can it expect?

• 2500

• 5000

• 7500

• 10000