Page 483 - Algebra 1

Identifying Correlations
State whether there is a positive correlation, a negative correlation, or no correlation between the data values.
a.
SOLUTION As the trend line rises from left to right, there is a positive correlation. Both sets of data values are increasing.
b.
SOLUTION Negative correlation: As x-values decrease the y = values increase.
c. height and shoe size
SOLUTION Positive correlation: Taller people tend to have larger feet.
d. date of birth and shoe size
SOLUTION No correlation: date of birth and shoe size are not related to
each other.
Matching Situations to Scatter Plots
Match each situation with the scatter plot that models it best.
a. number of trucks on the road and number of days in a month
b. time spent driving and distance traveled
c. number of months you own a car and the value of the car Graph 1 Graph 2 Graph 3
Example
3
y
x
x
10
9
8
7
6
5
4
3
2
y
60
63
72
75
77
81
83
89
92
Example
4
Math Reasoning
Generalize Explain the similarities between
a positive or negative slope of a line and a positive or negative correlation among data.
y
x
y
x
y
x
468 Saxon Algebra 1