<prompt> In a study to determine relationship between presence of I.H.D and smoking, the appropriate Statistical test isZ-testPaired t testChi-square testNone of the above  <response>: CHI-SQUARE TEST Chi-square x2 Test offers an alternate method of testing the significance of difference between two propoions. It has the advantage that it can also be used when more than two groups are to be compared. Steps 1 TEST THE NULL HYPOTHESIS 2 APPLYING THE x2 TEST 3 FINDING THE DEGREE OF FREEDOM 4 PROBABILITY TABLES Ref : Park 23rd edition Pgno : 852 