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The purpose of a crosstabulation is to show the relationship (or lack thereof) between two variables.
Although there appears to be some relationship between the two variables, is there any reason to believe that the differences in PDA ownership between different income categories is anything more than random variation?
A number of tests are available to determine if the relationship between two crosstabulated variables is significant. One of the more common tests is chi-square. One of the advantages of chi-square is that it is appropriate for almost any kind of data.
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Significance Testing for Crosstabulations |