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:

37	31	68
29	32	61
66	63	129

You plan to test whether the medicine has any effect on the cold by conducting a chi-square test for association on the data available. Calculate the chi-square test statistic(²)using SPSS. Give your answer to 4 decimal places.

a)²=

b)At = 0.05, the null hypothesis that the medicine has no effect isrejectednot rejected.