Find the expected frequency for the given Contingency Table, where the Observed frequency is 88 and 10. Use a 0.05 significance level to test the claim that getting an infection (cold) is independent of the treatment group. What does the result indicates about the effectiveness of Echinacea as a treatment for colds?
|
Treatment Group
|
|
Placebo
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Echinacea:20%extract
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Echinacea:60%extract
|
|
Infected
|
88
|
48
|
42
|
|
Not Infected
|
15
|
4
|
10
|