Example 2.1 Compute the value of the
correlation coefficient for the data obtained in the study of age and blood
pressure.
STEP 1 Make a table,
as shown here.
STEP 2 Find the values of xy, x2, and y2 and place these values in
the corresponding columns of the table. The completed table is
STEP 3 Substitute in the formula
and solve for r.
The correlation coefficient suggests a strong positive relationship between age and blood pressure.
By: Andrea Beatrice Pechueco
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