Question

From the following data available for 5 pairs of observations of two variables x and y, obtain combined S.D. for all 10 observations.

Where \(\displaystyle\sum_{i=1} ^{n} x_1 = 30, \displaystyle\sum_{i=1} ^{n} y_1 = 40, \displaystyle\sum_{i=1} ^{n} x_1^2 = 220, \displaystyle\sum_{i=1} ^{n} y_1^2 = 340, \)

Answer 1

Here, \(\displaystyle\sum_{i=1} ^{n} x_1 = 30, \displaystyle\sum_{i=1} ^{n} y_1 = 40, \displaystyle\sum_{i=1} ^{n} x_1^2 = 220, \displaystyle\sum_{i=1} ^{n} y_1^2 = 340, \)