Association Between Two Variables Scatter Plot

What are the two variables being compared in this scatter plot?

• Yogurt

• Temperature

• Sales

Answer explanation

To find the variables, look on the x-axis and the y-axis.

Temperature is x and sales is y!

What happens to sales as temperatures increase?

• Sales decrease.

• Sales do not change.

• Sales increase.

Is the relationship LINEAR or NONLINEAR?

• Linear

• Nonlinear

Answer explanation

It forms a straight line, which means it it shows a linear relationship with a constant rate of change.

Are there any outliers?

• Yes

• No

Answer explanation

There are no outliers because all data points follow a similar increasing pattern. Higher temperature is related to higher sales.

What are the variables being compared in the scatter plot?

• Questions Missed

• Test

• Time Studying

Are there any outliers?

• Yes, (45, 8).

• Yes, (40, 1).

• No.

Answer explanation

(45, 8) is an outlier because the point goes against the general negative pattern formed by the rest of the data.

Most students missed fewer questions the more they studied. However, this student studied a lot and missed a lot of questions.

Generally, the students who spent more time studying ...

• did not miss any more or fewer questions than those who did not spend time studying.

• missed more questions.

• missed fewer questions.

What kind of association does the scatter plot show?

• Positive

• Negative

• No association

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

The scatter plot below shows the number of books read by students in Mrs. Hall’s English class and their final grades. Which statement represents the best description about the line of best fit?

• The more books students read, the lower their English grade.

• The more books students read, the higher their English grade.

• The fewer books students read, the higher their English grade. 

• No relationship exists between the number of books students read and their English grades.