References
1. Bianco, F.(2018). Effectiveness of NYC Post-Prison Employment Programs Solution. Retrieved from: https://github.com/fedhere/PUI2018_fb55/blob/master/HW5_fb55_session1/effectivenesofNYCPost-PrisonEmploymentPrograms_solution.ipynb
2. Boslaugh, S & Watters, P.A.(2008). Statistics in a Nutshell. O’Reilly Media, Inc.: Sebastopol, CA
3. Kvalnes, T. (2012). A Short Guide to the Choice of Statistical Tests.  Retrieved from: http://folk.ntnu.no/thomakva/teaching/Guide_to_statistical_tests.pdf
4. Stanford University. (2017). Comparing multiple proportions. Retrieved from: https://web.stanford.edu/class/psych10/schedule/P10_W7L1
Appendix
Fisher's Exact Test:
The data this Mini-project uses can be summarized into a 2 by 2 contingency table. As a result, Fisher's Exact Test was also performed to investigate the two samples as it is designed to comparing binary variables from contingency tables. The results shows that the p value is very small. Therefore, we can reject the null hypothesis.