Load the Intl-POP data set and get scatterplots for the independent variable GNIcap (Gross National Income per

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Question:

Load the Intl-POP data set and get scatterplots for the independent variable GNIcap (Gross National Income per capita, a measure of affluence) and each of these dependent variables: BirthRate (birth rate or number of births per 1000 population), DthRate (death rate or number of deaths per 1000 population), and LifeExp (life expectancy or the average number of years of life a newborn infant can expect to live).

• Click Graphs, Legacy Dialog, and Scatter/Dot.

• On the Scatter/Dot window, click Simple Scatter and then click Define.

• On the Simple Scatterplot window

• Find BrthRate in the list of variables and move the variable name to the Y Axis: box.

• Find GNIcap and click the arrow to move the variable name to the X Axis: box.

• Click OK and the scatterplot will be sent to the SPSS output window.

• To add the regression line to the graph:

• Click anywhere on the graph and the Chart Editor window will appear.

• Click the Elements command at the top of the window and, in the drop-down menu, click Fit Line at Total.

• A new window will open. In the Fit Method panel, click Linear and then click Close.

• Close the Chart Editor window to return to the output window of SPSS.

• Repeat the Graphs, Legacy Dialog, and Scatter/Dot commands and, when you get to the Simple Scatterplot window, substitute DthRate for BirthRate. Repeat the instructions above to get a scatterplot for DthRate and GNIcap.

• Repeat the Graphs, Legacy Dialog, and Scatter/ Dot commands once more and substitute LifeExp for DthRate in the Simple Scatterplot window. Repeat the instructions above to get a scatterplot for LifeExp and GNIcap.

a. Describe each of these graphs in terms of the direction and strength of the relationship they display. Use the regression line and the spread of the dots around the line to make these determinations.

b. Do any of these scatterplots violate the assumption of linearity? How?