Consider this simple bivariate data set.

a) Draw a scatter plot for the data.
b) Describe the correlation between x and y as positive or negative.
c) Describe the correlation between x and y as strong or weak.
d) Identify any outliers.

The correct answer is:

Step 1 of 4:
The coordinate points corresponding to the give table are:
(1,1),(2,1.1),(3,1.3),(4,1.3),(5,1.4),(6,1.6),(7,1.8),(8,1)
The scatter plot based on the points is:

Step 2 of 3:
The trend line for the graph is:

It is clear that the trend line upwards. The slope of the line is positive. Hence, the correlation among the variables x and y are positive.
Step 3 of 4:
The points are clustered around the trend line closely and tightly. Most of the points lie on the line. Hence, the correlations among the variables are strong.
Step 4 of 4:
There exists an outlier in the graph.
It is located at (7, 1.8). It behaves differently as compared to the other set of values.
Note:
An outlier is a set of points that lie quite far away from the regression or trend line.

An outlier is a set of points that lie quite far away from the regression or trend line.