A state is considering using Global Positioning System (GPS) technology to track paroled sex offenders, but would like to conduct an experiment before adopting such a program on a larger scale. Seventy-five randomly selected parolees are ordered to wear bracelets with GPS tracking capabilities. Sixty-five randomly selected parolees are monitored by traditional methods (which consist of daily phone calls from parole officers). After 9 months, officials tabulate the following data on the proportion of re-offenders by group. What can state officials conclude from these data?

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GPS Group 16 59 Phone Group 23 42 Re-offenders Non-offenders