Homework SourseThree different drugs are used in a trial testing their effe
Three different drugs are used in a trial testing their effectiveness in relieving migraine headaches. There are 125 subjects assigned to each drug. The results are shown in the table below. Test the hypothesis of equal effectiveness, computing and interpreting the p-value.
Relief No Relief 95 30 87 38 85 40 Solution
H0: All drugs are of equal effectiveness
Ha: atleast two are different
Two tailed chi square test
Prepare contingency table as follows:
you\'re dealing with dependent variables; red, independent.
The chi-square statistic is 2.1848. The p-value is .335416. The result is not significant at p < .05.
As p value > alpha, accept null hypothesis that they have equal effectiveness.
| Results | ||||||
| A | B | C | Row Totals | |||
| Relief | 95 (89.00) [0.40] | 87 (89.00) [0.04] | 85 (89.00) [0.18] | 267 | ||
| No Relief | 30 (36.00) [1.00] | 38 (36.00) [0.11] | 40 (36.00) [0.44] | 108 | ||
| Column Totals | 125 | 125 | 125 | 375 (Grand Total) |
