Question

​define what is beween-groups , within-groups and mixed group study and an example of each?

Answer 1

Between groups desgin is an experiment where there are two or more groups of subjects, with each being tested by a different testing factor simultaneously. There are several advantages of this type of study, especially regarding the fact that different variables or multiple levels of variables can be tested at the same time. It also saves a great deal of time which is essential in situations such as those relating to healthcare. However, there are a few disadvantages as well, such as the fact that it requires a large number of participants to generate useful data.

A within-subjects design is an experiment in which the same group of subjects serves in more than one treatment. As an example of a within-subjects design, let’s say that we are interested in the effect of different types of exercise on memory. We decide to use two treatments, aerobic exercise and anaerobic exercise. In the aerobic condition we will have participants run in place for five minutes, after which they will take a memory test. In the anaerobic condition we will have them lift weights for five minutes, after which they will take a different memory test of equivalent difficulty. Since we are using a within-subjects design we have all participants begin by running in place and taking the test, after which we have the same group of people lift weights and then take the test. We compare the memory test scores in order to answer the question as to what type of exercise aids memory the most.

Mixed ability grouping or grouping students with all different abilities together. For example, you may create a mixed-ability group by grouping students of different ages, language levels, or academic levels. There are several benefits of using mixed-ability grouping. Students who are placed in groups with mixed abilities benefit because they are grouped with other students who are not like themselves. This allows for the opportunity to learn about and accept differences. Mixed-ability grouping is great for discussion purposes and getting others' perspectives on things. It also helps students to understand each other better by increasing interaction among students who may not otherwise get the opportunity to interact. This can promote tolerance and the understanding and acceptance of differences.