Cell phones and iPods are necessities for the current generation. Does the use of one indicate the use of the other? Seven junior high students who own both a cell phone and an iPod were randomly selected, resulting in the following data:

a. Complete the preliminary calculations: extensions, five sums, and SS(x), SS(y), and SS(xy).
b. Find r.

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Cell, n (phone #s) 42 7 75 78 126 22 23 iPod, n (songs saved) 303 212 401 500 536 200 278