Design of instrument
statistics is increasing involved in the first stags of research in the social sciences. In the designing of the instruments or questionnaires, statistics in used to determine how inferences on the construct measured can be made. The design of questionnaires depends on the operational definitions of the constructs that is to be measured bythe questionnaire, it is impossible to interpret any result derived from statistics analysis of the questionnaire. For example, the mean and standard deviations of the items used in measuring a certain construct can only be interpreted accurately if there is an objective approach of understanding the meaning from the statistics . Statistics is also used in the interpretation of the data, for example, whether a score of 40 would be possible to determine these groupings based on the population norms.