Review of Lessons 1.5, 6.3, 6.7 and Writing Equations of Lines
Algebra 1
Name __________________________________
Describe the trend in each scatter plot below. (Positive, Negative, or No correlation)
1.
2.
____________________
3.
____________________
____________________
Would you expect a positive correlation, a negative correlation, or no correlation between
the two data sets? Explain why.
4.
a person’s age and the number of pets he or she has
_______________
5.
the number of times you brush your teeth and the number of cavities you get
_______________
6.
the number of days it rains per year and the number of umbrellas sold
_______________
7. Use the scatter plot at the right.
a. Is the correlation between shoe size and height (positive, negative, no correlation)?
b. In the scatter plot, what does a point represent?
c. How can you tell if some people wore the same shoe size?
d. How can you tell if some of the people were the same height?
e. What is the approximate height of a person with a shoe size of 11?
Write a linear function for the graph. What do the slope and the y-intercept mean?
8. Total cost of operating a rental car for one day is a function of rental fee plus cost of gasoline.
Equation ____________________
Slope Means
__________________________________________________
__________________________________________________
Y-Int. Means __________________________________________________
__________________________________________________
Use a graphing calculator to find the equation of the line of best fit for the following data.
9.
x
1
2
3
4
5
y
7
5
-1
3
-5
10.
____________________
x
1
4
8
13
19
y
5
8
3
10
13
____________________
Draw a scatter plot. (Include a Line of Best Fit.)
Use a graphing calculator to find the equation of the line of best fit for the following data.
11.
Study Time
Incomplete Assignments
0
0
2
2
3
3.5
4
5
1
2
1
0
4
4
5
0
1
0
Equation ____________________
3
1
0
2