Bunker Hill Community College / MAT 098/181C / Form B 8. A marketing analyst is studying the relationship between x = amount spent on television following data represent a random sample from the study. Use this information for parts advertising and y = increase in sales. The data are reported in thousands of dollars. The a) to c). Round the answers to two decimal places. (20 pts) X (advertising) y 15 19 28 47 10 92 340 152 260 413 130 855 a. (sales increase) For this random sample, r = 0.95. What does r tell you about the association between x and y, as far as the direction and strength? Direction: Positive Strength: Strong. b. A lurking variable is a variable that is not measured in the study. It is a third variable that is neither the explanatory nor the response variable, but it affects your interpretation of the relationship between the explanatory and response variable. Identify one lurking variable in this study.