Lesson 8
Analyzing Bivariate Data
Problem 1
Different stores across the country sell a book for different prices. The table shows the price of the book in dollars and the number of books sold at that price.
price in dollars | number sold |
---|---|
11.25 | 53 |
10.50 | 60 |
12.10 | 30 |
8.45 | 81 |
9.25 | 70 |
9.75 | 80 |
7.25 | 120 |
12 | 37 |
9.99 | 130 |
7.99 | 100 |
8.75 | 90 |
- Draw a scatter plot of this data. Label the axes.
- Are there any outliers? Explain your reasoning.
- If there is a relationship between the variables, explain what it is.
- Remove any outliers, and draw a line that you think is a good fit for the data.
Solution
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Problem 2
Here is a scatter plot:
Select all the following that describe the association in the scatter plot:
Linear association
Non-linear association
Positive association
Negative association
No association
Solution
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(From Unit 6, Lesson 7.)Problem 3
Using the data in the scatter plot, what can you tell about the slope of a good model?
The slope is positive.
The slope is zero.
The slope is negative.
There is no association.
Solution
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(From Unit 6, Lesson 6.)