Please explain the importance of statistical and practical significance in evaluative research, with special reference to the two group comparison design using dichotomous nominal variables.
What will be an ideal response?
Ans: Without statistical significance, the data can be easily explained by chance irrespective of the type of test used to examine the relationship between variables. In the example given in the text in comparing the rates of success for the two groups the percentage of people in each group who were in the successful category indicate that 75% those in the treatment group were successful as compared to 50% of those in the comparison group, who did not receive the treatment. This difference is key for determining practical significance, when there is statistical significance.
Cognitive Domain: Comprehension
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