Question

lesson 3 - 5 scatter plots and lines of fit
quick review
a paired data set (or a bivariate data set) has
a positive association when y - values tend to
increase as x - values increase and a negative
association when y - values tend to decrease
as x - values increase. when the relationship
between the paired data can be modeled with
a linear function, a line of best fit represents
the relationship. the paired data are positively
correlated if y - values increase as x - values increase
and negatively correlated if y - values decrease as
x - values increase.
practice & problem solving
describe the type of association each
plot shows.
29.
30.

Explanation:

Step1: Analyze the scatter - plot 29

Looking at the scatter - plot 29, as \(x\) - values increase, \(y\) - values do not follow a clear upward or downward trend. There is no consistent pattern of \(y\) increasing or decreasing as \(x\) increases. So, there is no association.

Step2: Analyze the scatter - plot 30

Looking at the scatter - plot 30, as \(x\) - values increase, \(y\) - values tend to decrease. So, there is a negative association.

Answer:

1. No association.
2. Negative association.