Practice with
Scatter Plots and More
Topic Index | Algebra Index | Regents Exam Prep Center


Try the following questions:


The correlation seen in the graph at the right would be best described as:


high positive correlation
low positive correlation
high negative correlation
low negative correlation




You are asked to write an equation for the line of best fit for the scatter plot shown at the right without the use of a graphing calculator.  What should you do first?


Connect the points together.
Find the slope using (1,2) and (9,12).
Find the slope using (4,6) and (5,8).
Decide which two points give the most representative straight line.



3. True or False:  When data is graphed and a positive correlation is observed, the first set of data is always causing the affect seen in the second set of data.





4. The scatter plot at the right shows the number of chapters in a book in relation to the number of typos found in the book.  If you predict the number of typos that would occur in a book containing 12 chapters, you would be:






When making a scatter plot, you should never:


label the axes
connect the dots
plot more than one y value for any x value
use a graphing calculator




If you were asked to interpolate information from this graph, you would have to be careful to limit the number of chapters to:


between 2 and 8 chapters
between 1 and 9 chapters
chapters 2, 4, 6, and 8 only
there is no need to limit chapters




Another term for line of best fit is


scatter plot
trend line
tangent line




Prepare a scatter plot for the following data.  Determine from your graph whether there is a correlation between the number of hours spent in the mall and the number of dollars spent.

Hours in Mall 10 8 9 3 1 2 5 6 7 8 2 3
Dollars spent 40 15 24 20 10 35 50 70 18 25 100 60




The following chart shows the prices of gasoline and milk at a local convenience store for a period of three weeks.

Exam this data for correlations between the price of gasoline and the price of milk.  Comment on what a correlation between this data is saying.

Week: Gasoline Milk
1st week $2.89 $2.35
2nd week $2.95 $2.40
3rd week $3.04 $2.43





Which situation describes a situation that is not a causal relationship?


The rooster crows and the sun rises.
The more miles driven the more gasoline needed.
The more powerful the microwave the faster the food cooks.
The faster the pace of the runner the quicker the runner finishes.



11. For 10 days, Romero kept a record of the number of hours he spent listening to music. The information is shown in the table below.

Day 1 2 3 4 5 6 7 8 9 10
Hours 9 3 2 6 8 6 10 4 5 2
Which scatter plot shows Romero’s data graphically?