A Local Shopping Mall Would Like to Better Understand the Effectiveness

question 65

Multiple Choice

A local shopping mall would like to better understand the effectiveness of its security guards in preventing shoplifting.The mall's operation manager uses simple linear regression to develop an equation that predicts the number of daily shoplifting incidents at the mall's stores based on the number of security guards employed. The slope of the regression line is b = -1.2; the intercept of the regression line is a = 14.5.Compute the value of r, the correlation coefficient.

• A)-0.82
• B)0.52
• C)0.68
• D)0.82

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