1 The experimental design that employs two groups, in which the respondents are subjected to a post-test only, is called .
2 The experimental design that employs only one group (the experimental group) in which subjects are tested before and after the exposure to the stimulus is called .
3 The experimental design that employs one experimental and one control group in which only the experimental group is exposed to the stimulus is called .
4 The procedure employed in experimentation that aims to keep factors unrelated to the study out of the research process is called .
5 Studies including groups of people sharing a specific criterion (for example, age, gender, employment), employing the same methods and resembling panel/trend studies are called .
6 Studies employing samples from different sectors and comparing them according to a set of criteria that are related to the theme of the study are called .
7 The method of data collection in which the researcher discusses issues with a number of people congregated in the same place is called a .
8 The method of experimental sampling in which groups are matched on a number of relevant criteria and one becomes the experimental group and the other the control group is called .
9 The notion that knowledge of the fact that one is being studied may bias one’s normal behaviour and reaction to stimuli is called the .
10 The problem of experimentation associated with the fact that changes in the behaviour of the subjects in the after-test may be caused by events that happened between the two tests rather than due to the stimulus is called the .
11 The sampling procedure employed in experiments where subjects are taken randomly from the sampling frame and then placed, one by one, in the experimental and the control group in turn is called .
12 The experimental design that includes two experimental groups and one control group is called .
13 The sampling procedure employed in experimentation in which two same or similar subjects are chosen at a particular time, and one is placed in the experimental group while the other is in the control group is called .
14 The studies that involve research at different points in time, studying the same topic and using the same research instruments but different samples is called .
15 The procedure that includes more than one set of samples, in order to improve the quality of research, is called .