Statistical Analysis for Education and Psychology Researchers

G 23.1 35.1

H 45.0 36.0

I 12.9 17.7

J 13.9 18.5

In the population is there a correlation, at the school level, between the socioeconomic
indicator FSME and performance on the CAT?
The first step in answering this question is to plot the data to identify the nature of the
relationship between the two variables. In this case both variables have been
standardized, they are percentages and are therefore ranked. The data from Table 7.1 on
%FSME and %CAT scores are plotted in Figure 7.2.

Figure 7.2: Scatterplot of %FSME and

%CAT scores for ten schools

The SAS code that produced this plot is given below:

data a;

infile 'a:nonpara.dat';

input school $ fsme cat;

proc plot;

plot fsme*cat='+'/vaxis=0 to 50 by 5 haxis=0 to 50

by 5;

Statistical analysis for education and psychology researchers 210