The more the sample represents the population the more accurate are the results of the study. Sample can be made more representative either by increasing the size of the sample or by following more reliable method of sampling.
In normative researches only data are collected from the survey and after 'analysing them results are declared. Thus there is no need of manipulating independent variables. In ex-post facto-research effects are already known and researcher studies the causes lying behind these r effects. Here too independent variable are not manipulated.
9.
A teacher encounters various problems during his professional experiences. He should
It is but natural to face various problems in life and seeking solutions to these problems is a must. A true teacher always tries to get solution of his problem by doing formal or informil researches
10.
Area (cluster) sampling technique is used when
A.
population is scattered and large size of the sample is to be drawn
When long survey is being done and population is being scattered over a large area then researcher selects various groups from the whole area. The selection of these groups is based on the discretion of the researcher.