Topic 4 Bivariate Data

_________ is a diagram that uses coordinates to display values for two variables for a set of data.

• dot plot

• scatter plot

• histogram

• stem and leaf plot

Bivariate data involves

(Bi is a prefix that means "two". Like in bicycle)

• one variable

• two variables

• three variables

• four variables

If a scatter plot has a positive correlation, as the x value gets ​ (a)   the y value goes ​ (b)  

• bigger,
• up.
• down
• sideways

Choose two words from those listed below to best describe the correlation between the two variables.

• strong

• weak

• positive

• negative

Answer explanation

This is weak because the points are not very close together. It is negative because the y values decrease as the x values increase.

If a scatter plot has a negative correlation, as the x value goes ​ (a)   the y value goes ​​ (b)  

• up,
• down
• sideways
• Omaha

Answer explanation

In a negative association, the y value goes down as the x value grows.

Choose two words from those listed below to best describe the correlation between the two variables.

• strong

• weak

• positive

• negative

What is the type of association?

• Negative 
• no association
• positive 

The scatter plot shows the relationship between the number of chapters and the total number of pages for several books.  Use the trend line to predict how many chapters would be in a book with 180 pages. 

• 12 chapters

• 15 chapters

• 18 chapters

• 21 chapters

Answer explanation

When we use a trend line, we don't really "guess", we just follow the line to the intersection we want and use the numbers it tells us.

Which of the following lines represents the line of best fit for the scatter plot?

• A
• B
• C
• D

Tags

CCSS.8.EE.B.5

What is a line of best fit used for?

• To make predictions
• To make the graph look pretty
• To connect the points
• To make it look like you know what you are doing