(b) Use a calculator to verify that Sigma x = 24.1, Sigma x^2 = 85.31, Sigma y =

Question

(b) Use a calculator to verify that Sigma x = 24.1, Sigma x^2 = 85.31, Sigma y = 54.3, Sigma y^2 = 470.63 and Sigma xy = 192.02. Compute r. (Round to 3 decimal places.) As x increases, does the value of r imply that y should tend to increase or decrease? Explain your answer. Given our value of r, y should tend to increase as x increases. Given our value of r, y should tend to decrease as x increases. Given our value of r, y should tend to remain constant as x increases. Given our value of r, we can not draw any conclusions for the behavior of y as x increases.

Explanation / Answer

(a) r = xy / (x^2 * y^2)

= 192.02/(85.31 * 470.63)

= 0.958

(b) As r is positive, y increases as x increases. Option A.

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