Statistics for Business: Decision Making and Analysis, 3rd Edition

Think About It

1. 21.

   1. Response: total cost; explanatory: number of items. Scatterplot: linear, positive direction with lots of variation

   2. Response: items produced; explanatory: hours worked. Scatterplot: positive direction, linear (with perhaps some curvature for long hours), and moderate variation

   3. Response: time; explanatory: weight. Scatterplot: negative direction, probably linear with lots of variation in the times

   4. Response: gallons left; explanatory: number of miles. Scatterplot: negative direction, linear, with small variation around the trend

   5. Response: price change; explanatory: number recommending. Scatterplot: little or no pattern

2. 23.

   1. Positive association, but weak

   2. Positive, 0.5

   3. It increases the correlation. The correlation would decrease. ...