LCD TVs, continued Refer to Exercise 3.19. Suppose we assume that the relationship b...

LCD TVs, continued Refer to Exercise 3.19. Suppose we assume that the relationship between x and y is linear.

a. Find the correlation coefficient, r. What does this value tell you about the strength and direction of the relationship between size and price?

b. Refer to part a. Would it be reasonable to construct a regression line used to predict the price of an LCD TV based on the size of the screen?

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How to Choose a TV As technology improves, your choice of televisions becomes more complicated. Should you choose an LCD TV, a plasma TV, and with rear or front projection? In the table below, Consumer Reports6 gives the prices and screen sizes for the top 10 LCD TVs in the 46-inch and higher categories. Does the price of an LCD TV depend on the size of the screen?

a. Which of the two variables (price and size) is the independent variable, and which is the dependent variable?

b. Construct a scatterplot for the data. Does the relationship appear to be linear?