Homework Answers
applying chi square test:
| Observed | OBS | placebo | Herb: 20% extract | Herb:60% extract | Total |
| got a cold | 84 | 54 | 44 | 182 | |
| not got a cold | 14 | 4 | 12 | 30 | |
| Total | 98 | 58 | 56 | 212 | |
| Expected | Ei=?row*?column/?total | placebo | Herb: 20% extract | Herb:60% extract | Total |
| got a cold | 84.13 | 49.79 | 48.08 | 182 | |
| not got a cold | 13.87 | 8.21 | 7.92 | 30 | |
| Total | 98 | 58 | 56 | 212 | |
| chi square | =(Oi-Ei)2/Ei | placebo | Herb: 20% extract | Herb:60% extract | Total |
| got a cold | 0.00 | 0.36 | 0.35 | 0.70 | |
| not got a cold | 0.00 | 2.16 | 2.10 | 4.25 | |
| Total | 0.00 | 2.51 | 2.44 | 4.955 |
2
=4.955
p value =0.084
since the p value is greater than .........2)fail to reject ...........3) is not .............4) does not appear
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