Question

calculate correlation Coefficient using step deviation method
X- 550,600,800,700,650
Y- 400,450,550,550,400​

Answer 1

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(2, 3), (4, 5), (5,7). The mean of the x values, the mean of 1, 2, 4, and 5 is 3.

We also have that 4.

The standard deviation of the x values is sx = 1.83 and sy = 2.58.

The table below summarize the other calculations needed for r.

The sum of the products in the rightmost column is 2.969848.

Since there are a total of four points and 4 – 1 = 3, we divide the sum of the products by 3.

This gives us a correlation coefficient of r = 2.969848/3 = 0.989949.

Answer 2

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