?. Identify the independent and dependent variables in each of the following exa

Question

?. Identify the independent and dependent variables in each of the following examples. Example #1 : A fitness instructor wants to test the effectiveness of a performance-enhancing herbal supplement on students in her exercise class. The students are assigned too groups at random. The instructor gives Group A the herbal supplement and Group B receives a sugar pill. The students' fitness level is compared before and after six weeks of consuming the supplement or the sugar pill. Example #2: A nutritionist wanted to determine if exercise combined with a low carbohydrate diet was more effective than a low carbohydrate diet alone in helping women return to their normal body weight after giving birth. The researcher measure the weight of 75 postpartum women and assigned 25 to follow a low Carbohydrate Diet and 25 to follow the low Carbohydrate diet with daily exercise. A third group 25 was assigned no the subjects were measured after 2 months.

Explanation / Answer

An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable. A dependent variable is the variable being tested and measured in a scientific experiment.

1. Here performance is dependent variable as it depends on herbal supplements or sugar pills. And herbal supplements and sugar pills are independent variables as they are varied among the group of students.

2. Here body weight is the dependent variable. The variables that are varied are exercise and low carbohdyrates diet. Hence, exercise and low carbohdyrates diet are independent variables.

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