Question

For problems 10B and 10C refer to the following table.

The paired values represent the weights (carats) and prices (dollars) of randomly selected diamonds.

Weight	0.2	0.4	0.5	0.6	0.9	0.7	0.8
Price	610	1354	1343	1752	5605	2277	2600

10B) Compute the least squares regression line for the predicted price for a given weight.

a. y = 5743.8x + 1144.1     b. y = -5743.8x - 1144.1     c. y = -5743.8x + 1144.1     d. y = 5743.8x - 1144.1

10C) Calculate the correlation coefficient between the two variables.

a.      0.7518			c.       0.6671
b.        0.8495			d.      -0.8671

Answer 1

10B)

option D is correct

10C)

correlation coefficient r=

Sxy/(√Sxx*Syy) =

0.8495

option B is correct