Stat 1040
Chapter 9 Solutions

    1. False - it's the other way round. Below-average values of the dependent variable tend to be associated with above-average values of the independent variable.
    2. False. For example, height in inches is usually less than weight in pounds, but the correlation coefficient is positive.

  2. False - these are cross-sectional data not longitudinal data. Younger people were born more recently and education levels have been going up over time.

  3. Quite a bit less because this is an ecological correlation.

    1. Education is measured in whole years.
    2. Some dots correspond to more than one couple.
    3. A (iv), B (iii), C (i).