Statıstıcs I Deneme Sınavı Sorusu #809537

In order to investigate the impact of playing online games on developing English speaking skills, we make a group of students play online games for four hours a day and prevent another group of students playing any English online games. What type of research we are conducting?


Case

Sampling

Observational

Experimental

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Yanıt Açıklaması:

Experimental study is a study in which the researcher manipulates some of the variables and try to determine how the manipulation influences other variables. In an experimental study, one or more independent variables are controlled so as to obtain information about their influence on the dependent variable. However, researchers cannot control all the variables having effects on the dependent variable. In this case, randomization techniques are applied to balance out the influence of any uncontrolled variable that might affect the variable of interest. Suppose we want to investigate the effects of exercise on cold by using an experimental design. For this purpose, we obtain a group of individuals who are the volunteers to participate the study. Then, we randomly assign the participants to the treatment (exercise) and control (no exercise) groups. After a lapse of time, we record the number of colds for each individual from the two experimental groups.

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