Using chi-square, test the null hypothesis that the prevalenceof serious mental illness does not differ by type of substanceabuse.
A sample of 118 college students is asked whether they areinvolved in campus activities. Using the following cross tabulationdepicting student responses by the region in which their collegesare located, conduct a chi-square test of significance for regionaldifferences.
Campus Activity Participation
Region    Involved     Uninvolved
East           19                    10
South        25                     6
Midwest       15                  15
West             8                      20
