موضوع 6
The test of significance is a method of making due allowance for the sampling fluctuation affecting the results of experiments or observations. The fact that the results of biological experiments are affected by a considerable amount of uncontrolled variation makes such test necessary. These tests enable us to decide on the basis of the sample results, if :
i.The deviation between the observed sample statistic and the hypothetical parameter value, or
The deviation between two sample statistics, is significant or might be attributed to chance or the fluctuation.