A pharmaceuticals company claims to have developed a cure for the common cold. I

Question

A pharmaceuticals company claims to have developed a cure for the common cold. In order to test whether this is true, one group of recent cold-sufferers was given this medicine and another group was given a placebo instead. The selection process was completely random. The participants were examined two hours after they were given the medicine or placebo. The results are tabulated below: You plan to test whether the medicine has any effect on the cold by conducting a c square test for association on the data available. Calculate the chi-square test statistic (x^2) using SPSS. Give your answer to 4 decimal places.

Explanation / Answer

from above X2 =0.7276

b) p value =0.3937

as p value is greater then 0.05 levee , not rejected

Observed O placebo medicine Total No effect 35 44 79 cold cured 26 24 50 Total 61 68 129 Expected E=rowtotal*column total/grand total placebo medicine Total No effect 37.4 41.6 79 cold cured 23.6 26.4 50 Total 61 68 129 chi square =(O-E)^2/E placebo medicine Total No effect 0.149 0.133 0.282 cold cured 0.235 0.211 0.446 Total 0.384 0.344 0.728

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