Problem

Suppose that an advertising campaign for a new product is conducted in 10 test cities. The...

Suppose that an advertising campaign for a new product is conducted in 10 test cities. The intensity of the advertising x, measured as the number of exposures per evening of prime-time television, is varied across cities; the awareness percentage y is found by survey after the ad campaign:

x:	4.0	4.5	5.0	5.5	6.0	6.5	7.0	7.5	8.0	8.5
y:	10.1	10.3	10.4	21.7	36.7	51.5	67.0	68.5	68.2	69.3

a. Interpret the correlation coefficient ryx.
b. Plot the data. Does the relation appear linear to you? Does it appear to be generally increasing?

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Solutions For Problems in Chapter 11

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