Scientific method and variables

What is the main goal of science?

• To prove existing theories

• To understand supernatural events

• To produce information about the natural world

• To develop new inventions

Which of the following is the initial step in the scientific method?

• Formulating a hypothesis

• Analyzing collected data

• Identifying a problem or making an observation

• Conducting an experiment

What is an independent variable in an experiment?

• The factor that is measured or observed.

• The factor that is kept constant between groups.

• The factor that is changed or manipulated by the experimenter.

• The group that receives no special treatment.

Are you enjoying the video lesson?

• Yes

• No

Why is the data from the second experiment considered invalid?

• The music was not controlled.

• There were too many variables.

• The sleep hours were not consistent.

• The food was not controlled.

A student wants to know if his new study method is more successful than his traditional study method. For one month, he studies for his classes using his traditional study method. The next month, he studies for his classes using his new study method. At the end, he compares his grades. What is the independent variable in this experiment?

• The student's grades

• The study method used

• The duration of study (one month)

• The student's motivation