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Louis Katz, a cost accountant at Papalote Plastics, Inc. (PPI) , is analyzing the manufacturing costs of a molded plastic telephone handset produced by PPI. Louis's independent variable is production lot size (in 1,000's of units) , and his dependent variable is the total cost of the lot (in $100's) . Regression analysis of the data yielded the following tables:
The correlation coefficient between Louis's variables is ___.
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