Can you draw a trend line? If so, which direction does it point as you move from left to right on the graph?
Scatter Plot:
Type of Correlation: Negative
Practice makes perfect
We were given a data table describing the sales of messenger bags.
Messenger Bag Sales
Price ($)
30
45
60
75
Number Sold
150
123
85
50
When analyzing data using a scatter plot, there are three general outcomes for the correlation of the data: positive correlation, negative correlation, or no correlation.
Observation
Type of Correlation
As x increases, y increases.
Positive
As x increases, y decreases.
Negative
There is no visible pattern.
No
By treating the table as a set of points, we have graphed the given data as a scatter plot. Do you see any trends?
It looks like there is some kind of correlation. Let's draw a line of fit, or trend line, to help us identify the type of correlation. To do so, we will draw a line that appears to fit the data closely.
As the price increases, the number of messenger bags sold decreases. This indicates a negative correlation between the price and the number of messenger bags sold.
