Question

The table below gives the list price and the number of bids received for five randomly selected items sold through online auctions. Using this data, consider the equation of the regression line, yˆ=b0+b1x, for predicting the number of bids an item will receive based on the list price. Keep in mind, the correlation coefficient may or may not be statistically significant for the data given. Remember, in practice, it would not be appropriate to use the regression line to make a prediction if the correlation coefficient is not statistically significant.

Price in Dollars	23	24	36	40	41
Number of Bids	1	2	3	4	8 Table Copy Data Step 5 of 6: Substitute the values you found in steps 1 and 2 into the equation for the regression line to find the estimated linear model. According to this model, if the value of the independent variable is increased by one unit, then find the change in the dependent variable yˆy^. Step 6 of 6 : Find the value of the coefficient of determination. Round your answer to three decimal places.

Answer 1

from above regression equation: y^ =-4.697+0.253*x

Step 5 of 6 : change in the dependent variable y^ =b1 =0.253

Step 6 of 6 :

SST=Syy=		29.2000
SSR =(Sxy)2/Sxx =		19.3777

Coeffficient of determination R2=SSR/SST=0.664