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Statistics in Criminal Justice

Statistics in Criminal Justice. SPSS Example: You are interested in whether number of days of poor physical health per month
(PHYSHLTH) differs between white and non-white respondents (RACEBINARY). You are
willing to take a 1% risk of a false positive.
Null hypothesis: White and non-white respondents do not differ in terms of number of days of
poor physical health per month.
Research hypothesis: White and non-white respondents differ in terms of number of days of poor
physical health per month.

First, you need to examine the results of Levene’s Test, which tells you whether you can assume
that variances within each group are equal in the population. The test statistic (F = 0.213) is
significant at 0.644, which is greater than our significance level of 0.01. Thus, we can assume
equal variances.
The t-values are the same for both rows, but you would use the top row since we can assume
equal variances. T = 0.101 which is significant at 0.919. This is greater than our significance
level of .01, and thus, we fail to reject the null hypothesis. White and non-white respondents do
not significantly differ in terms of days of poor physical health per month.

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