1:49 (a) When possible, the best way to establish that an observed association i

Question

1:49 (a) When possible, the best way to establish that an observed association is the result of a cause-and-effect relation is by means of A. the square of the correlation coefficient. B. a well designed experiment. D. the least squares regression line. E. None of the above. (b) The owner of a chain of supermarkets notices that there is a positive correlation between the sales of beer and the sales of ice cream over the course of the previous year Seasons when sales of beer were above average, sales of ice cream also tended to be above average. Likewise, during seasons when sales of beer were below average, sales of ice cream also tended to be below average. A plausible explanation of these facts is that A. a scatterplot of monthly ice cream sales versus monthly beer sales would show that a straight line describes the pattern in the plot, but it would have to be a horizontal line. B. the sale of beer and ice cream may both be affected by another variable such as the outside temperature. C. drinking beer causes a desire for ice cream or eating ice cream causes a thirst for D. the sales records must be in error. There should be no association between beer and ice cream sales. E. None of the above. cl A research verage, the

Explanation / Answer

1:49 (a) When possible, the best way to establish that an observed association is the result of a cause-and-effect relation is by means of A. the square of the correlation coefficient. B. a well designed experiment. D. the least squares regression line. E. None of the above. (b) The owner of a chain of supermarkets notices that there is a positive correlation between the sales of beer and the sales of ice cream over the course of the previous year Seasons when sales of beer were above average, sales of ice cream also tended to be above average. Likewise, during seasons when sales of beer were below average, sales of ice cream also tended to be below average. A plausible explanation of these facts is that A. a scatterplot of monthly ice cream sales versus monthly beer sales would show that a straight line describes the pattern in the plot, but it would have to be a horizontal line. B. the sale of beer and ice cream may both be affected by another variable such as the outside temperature. C. drinking beer causes a desire for ice cream or eating ice cream causes a thirst for D. the sales records must be in error. There should be no association between beer and ice cream sales. E. None of the above. cl A research verage, the

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