Scatter Plots and Data Study Guide

The scatter plot shows the number of steps a person walked and the number of hours of TV a person watched on a given day.

Does the data demonstrate positive, negative or no association?

• Positive because as the number of TV hours increase, the steps walked increases.

• Negative because as the number of TV hours increases, the steps walked decreases.

• No association because there would be no impact on how much TV a person watches in a day and the number of steps they walk.

What is an equation for the line of best fit?

• y = 20/3 x + 40

• y = -20/3 x + 40

• y = -20/3 x - 40

• y = 20/3 x - 40

• A

• B

• C

• D

What is the slope of the trend line equation, and what does it mean in the context of the situation?

• The slope of -1/4 means that for every 4 people who receive the vaccine, 1 less person will get the flu.

• The slope of -1/4 means that for every1 people who receive the vaccine, 4 less people will get the flu.

• The slope -1/4 means that for every 4 people who get the vaccine, 1 person will get the flu.

• Hint: Remember that slope is the change in y over the change in x. DON'T PICK THIS ANSWER....IT IS JUST A CLUE.

What is the Y-INTERCEPT of the trend line equation, and what does it mean in the context of the situation?

• The y-intercept is the number of cases of the flu in total.

• The y-intercept is the number of cases of the flu with 0 vaccines given.

• The y-intercept is the number of vaccines when there are 0 cases of the flu.

• Hint: Remember that y-intercept is the value of y when x is 0. Read what represents x and what represents y. DON'T PICK THIS ANSWER....IT IS JUST A CLUE.

• Positive Association because as the length of the movie increases, the number of actors increases.

• Negative Association because as the length of the movie increases, the number actors decreases.

• There is no association at all because how long a movie is has no affect on how many actors are in the movie.

• Positive Association because as the number of hours practicing increases, the number mistakes increases.

• Negative Association because as the number of hours practicing increases, the number of mistakes decreases.

• There is no association at all because how long you practice for has no impact on the number of mistakes a musician makes.

• Positive Association

• Negative Association

• No association

• cost of the phone bill

• cost of the heating bill

• distance the parking is from the building

• number of pets allowed

For the scatter plot, label the association as positive, negative or none, linear, non-linear. Check all that apply....reminder, for linear ONLY you would determine positive or negative.

• Positive

• Negative

• No Association

• Linear

• Non-Linear