CBSE Class 8 Answered

1.Cross sectional survey
Collecting information from the respondents at a single period in time uses the cross-sectional type of survey. Cross- sectional surveys usually utilize questionnaires to ask about a particular topic at one point in time. For instance, a researcher conducted a cross-sectional survey asking teenagers’ views on cigarette smoking as of May 2010. Sometimes, cross-sectional surveys are used to identify the relationship between two variables as in a comparative study. An example of this is administering a cross-sectional survey about the relationship of peer pressure and cigarette smoking among teenagers as of May 2010.

2. Longitudinal Surveys

When the researcher attempts to gather information over a period of time or from one point in time up to another, he is doing a Longitudinal survey. The aim of longitudinal surveys is to collect data and examine the changes in the data gathered.