Correlations (Situation)
Outliers and Predictions
Correlations (graphs)
Reading & Creating Scatterplots
Line of Best Fit
100
Hours of exercise and weight loss.
positive
100
What is an outlier?
What is a point that is distant from the rest of the data?
100
What type of correlation does this graph show?
What is positive?
100
What two pretty points could you use to determine the line of best fit?
What is (16,300) and (22,500)
100
How do you determine where to place the line of best fit?
There should be an equal number of points above and below the line.
200
Temperature outside and amount of sno-cones sold
positive
200
Which point is the outlier?
What is approximately (30, 6000)?
200
What type of correlation is shown in the scatter plot?
What is negative?
200
Estimate the y-intercept of this graph
5 or 5.5
200
Two points on the line of best fit are (4, 85) and (2, 70).
Find the slope for the line of best fit using these points.
15/2
300
Temperature outside and number of pets
no
300
Based on the scatter plot how many CDs would be sold for 2 jars of jam?
What is about 15 CDs?
300
What type of correlation is shown?
What is no correlation?
300
How do you make predictions using a scatter plot?
Use the line of best fit
Use the equation for the line of best fit.
300
What are two pretty points on the line of best fit?
Two points on the line of best fit are: (4, 1) and (3, 2)
400
Time spent doing homework and number of missing assignments.
negative
400
If a person is 45 years old, based on the scatter plot, what should they expect their income to be?
What is about 45,000.
400
Create a scatter plot that has a strong positive correlation.
Answers may vary.
400
Explain what this graph is about.
400
What do you have to use to draw your line of best fit?
a ruler
500
Number of visitors to a water park and temperature.
positive
500
The equation for the following line of best fit is y=-4x+80. Using your equation, determine the resting heart rate of someone who exercises 4.5 hours each week.
62 beats per minute
500
Create a scatter plot that has a negative weak correlation.
Answers may vary.
500
What does the point (30,195) mean on this graph in the story?
30 pizzas sold earns $195.
500
True or false and explain.
I can use any two points of a given set of data to determine the line of best fit for the data.
False, the points MUST be on the line of best fit.