Independent vs. Dependent
Outliers and Predictions
Correlations
Reading & Creating Scatterplots
Line of Best Fit
100
This variable goes on the x-axis.
Independent variable
100
What is an outlier?
Point that is distant (skewed) from the rest of the data
100
What type of correlation does this graph show?
Positive
100
What are two points on the line of best fit?
(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
This variable is impacted by the other variable and is placed on the y-axis.
Dependent variable
200
Which point is the outlier?
(30, 6000)
200
What type of correlation is shown in the scatter plot?
Negative
200
Will the slope of the line of best fit be positive or negative?
The line will have a negative slope.
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
If I am graphing the number of shots made and the hours of practice for a player, which would be the independent variable?
Number of hours of practice
300
Based on the scatter plot how many CDs would be sold for 2 jars of jam?
15 CDs
300
What type of correlation is shown?
No correlation.
300
What are the things we can do to be able to FULLY analyze a scatter plot? (There are 4 things for a perfect answer)
1) Identify the correlation 2) Analyze the meaning 3) Draw a line of best fit. 5) Write an equation and use it to make a prediction.
300
Two points on the line of best fit are: (4, 1) and (3, 2). What is the slope of the line??
Slope = -1
400
On a graph showing the relationship between salary and years of experience which variable would be the dependent variable?
Salary
400
If a person is 45 years old, based on the scatter plot, what should they expect their income to be?
45,000
400
Describe what a positive correlation means for data.
When one variable increases the other variable will also increase.
400
Describe the correlation of this data.
No correlation
400
The height and age of a child can be modeled by the equation
y = 2.9216x + 24.863
What does the y-intercept represent in this situation?
A child who is 0 years old is 24.863 inches tall
500
Write a sentence describing the relationship between the average daily temperature and the number of beach visitors.
The number of beach visitors increases as the average daily temperature increases.
500
Why should all points be as close to the line as possible? (Why should we try to draw the BEST line?)
So that our data is actually being represented. The line needs to match the data we have.
500
Give an example of two things that are NOT related. (Their graph would have NO correlation)
Answers will vary.
500
Describe the correlation of this data.
Nonlinear positive correlation
500
The cost of a flight is related to the length of the flight and can be modeled by the equation
y = .0844x + 38.3
What is the cost of a flight that is 625 miles?
$91.05