The following table shows the selling prices, in thousands of dollars, and the square footages of seven randomly selected houses recently sold by Century 21 Realtors. These data can also be found in the Excel file Century 21.xlsx.

a. Using α = 0.05, calculate the Spearman rank order correlation coefficient.
b. Perform a hypothesis test to determine if the population rank correlation coefficient is different than zero.

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Selling Price () Square Footage 258 191 253 168 249 245 282 2730 1860 2140 2180 2310 2450 2920