Null hypothesis 4 65 Null hypothesis 5(a) 67 Null hypothesis 5(b) 68 Null hypothesis 6(a) 69 Null hypothesis 6(b) 71 Null hypothesis 7 72 CHAPTER 5. CONCLUSIONS, SUMMARY, AND RECOMMEN DATIONS 79 Conclusions 79 Null hypothesis 1 Conclusion 1 Null hypothesis 2 81 Conclusion 2 Null hypothesis 3 Conclusion 3 Null hypothesis 4 Conclusion 4 83 Null hypothesis 5 84 Conclusion 5 84 Null hypothesis 6 84 Conclusion 6 85 Null hypothesis 7 85 Conclusion 7