Scatter Plots & Lines of Best Fit

NAME______PER.______

SCATTER PLOTS & LINES OF BEST FIT

Tell whether the graph shows a positive, a negative, or no correlation.

1) ______/ 2) ______/ 3) ______

Draw a line of best fit for each scatter plot.

4) /
5)

Using the data in each table, sketch a graph and answer the questions that follow.

The average California Achievement Test scores in mathematics and science for WesleyHigh School sophomores from 1995 to 1999 are given in the table of data.

6) Draw a scatter plot of the data. Use the

coordinate plane provided.

7) What type of correlation does the scatter

plot show?______

8) Predict the science score corresponding to a mathematics score of 50. ______

9) Predict the mathematics score corresponding to a science score of 65. ______

The scatter plot below shows the weight loss per week of a dieter. In the graph ‘y’ represents the person’s weight in pounds, and ‘x’ represents the weeks of the diet.

10) Draw the line of best fit.

11) Find two points on the line:

Point 1:______

Point 2:______

12) Find the slope of the line:

______

13) Write the equation of the line:

______

14) Use the equation to find the dieter’s approximate weight after 10 weeks. ______

EOC PRACTICE

15. ______/
What is the equation of the line:
A. y = -3x + 2
B. y = x + 2
C. y = 3x + 2
D. y = -x + 2
16. ______/ A submarine was 50 feet below the surface ofthe water. It started to descend at a constantrate of 10.5 feet per minute. Which equation
could be used to determine d, the submarine’s depth in the water after t minutes of descent?
A. d = -10.5t – 50
B. d = -60.5t
C. d = -10.5t + 50
D. d = 60.5t