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To Draw a Scatter Diagram

Example:  The per capita gross domestic product (GDP) of a country is the average income of a resident of the country. A researcher would like to know if per capita GDP could be used to predict life expectancy.  The data in the table below represent the per capita GEP (in thousands of U.S. dollars) for randomly selected countries in Western Europe and the life expectancy of resident of the country.  Draw a scatter diagram of the data.

Press STAT, highlight 1 : Edit and clear L1 and L2. Enter the values of the predictor variable (per capita GDP) into L1 and the values of the response variable (life expectancy) into L2. Press 2^nd , select 1: Plot 1, turn ON Plot 1 and press ENTER. For Type of graph, select the scatter plot which is the first selection. Press ENTER. Enter L1 for Xlist and L2 for Ylist. Highlight the first selection, the small square, for the type Of Mark. Press ENTER. Press ZOOM and 9 to select ZoomStat.

This graph shows a positive linear correlation: as per capita GDP rises, life expectancy also rises.