video media consultant collected the following data on popular LED televisions sold through on-line retailers.

a. Does there appear to be a linear relationship between the screen size and the price?
b. Which variable is the €œdependent€ variable?
c. Using statistical software, determine the regression equation. Interpret the value of the slope in the regression equation.
d. Include the manufacturer in a multiple linear regression analysis using a €œdummy€ variable. Does it appear that some manufacturers can command a premium price?
e. Test each of the individual coefficients to see if they are significant.
f. Make a plot of the residuals and comment on whether they appear to follow a normal distribution.
g. Plot the residuals versus the fitted values. Do they seem to have the same amount of variation?

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Manufacturer Screen Price Manufacturer Screen Price Sharp 46 736.50 Sharp 37 657.25 1150.00 Samsung 52 Sharp 32 426.75 Samsung 46 895.00 Sharp 52 1389.00 625.00 773.25 Samsung Sharp Sony Sharp 40 40 874.75 517.50 42 32 Samsung 46 961.25 Samsung 52 1475.00 686.00 Sony 954.25 Samsung 40 40 Sharp 37 574.75 Sony 52 1551.50 Sony Sony Sharp Sony Sony 46 1000.00 46 1303.00 40 722.25 46 1430.50 52 1307.50 Sony 52 1717.00 Samsung 32 373.75