The following tablewas presented in an article summarizing a study to compare a newdrug to a standard drug and to a placebo.
Characteristic* | New Drug | Standard Drug | Placebo | p |
Age, years | 45.2 (4.8) | 44.9 (5.1) | 42.8 (4.3) | 0.5746 |
% Female | 51% | 55% | 57% | 0.1635 |
Annual Income,$000s | 59.5 (14.3) | 63.8 (16.9) | 58.2 (13.6) | 0.4635 |
% with Insurance | 87% | 65% | 82% | 0.0352 |
Disease Stage | | | | 0.0261 |
Stage I | 35% | 18% | 33% | |
Stage II | 42% | 37% | 47% | |
Stage III | 23% | 51% | 20% | |
*Table entries andMean (SD) or %
- Are there any statistically significant differences in thecharacteristics shown among the
treatments?  Justify your answer.
- Consider the test for differences in age among treatments.Write the hypotheses and the formula of the test statistic used (Nocomputations required – formula only).
- Consider the test for differences in insurance coverage amongtreatments. Write the hypotheses and the formula of the teststatistic used (No computations required – formula only).
- Consider the test for differences in disease stage amongtreatments. Write the hypotheses and the formula of the teststatistic used (No computations required – formula only).
