Independent and Dependent Variables

What is a variable in the context of scientific experiments?

• A variable is a constant factor that does not change during an experiment.

• A variable is any factor, trait, or condition that can exist in differing amounts or types.

• A variable is a specific type of measurement used in data analysis.

• A variable is an unchangeable element in a scientific hypothesis.

What role does repetition play in scientific experiments?

• Repetition helps to verify results and ensure that they are reliable and not due to chance.

• Repetition is used to make experiments more complex and difficult to understand.

• Repetition is unnecessary in scientific experiments as one trial is sufficient.

• Repetition serves to confuse the results and make them less reliable.

How do you identify the dependent variable in an experiment?

• By determining what factor is being measured or observed in response to changes in the independent variable.

• By identifying the variable that is manipulated by the researcher.

• By selecting the variable that remains constant throughout the experiment.

• By observing the initial conditions before any changes are made.

What is the significance of a variable being 'controlled'?

• A controlled variable is kept constant to ensure that the experiment tests only the effects of the independent variable.

• A controlled variable is allowed to change to observe its effects on the dependent variable.

• A controlled variable is the main focus of the experiment and is manipulated by the researcher.

• A controlled variable is irrelevant to the experiment and can be ignored.

What is an example of an independent variable in a plant growth experiment?

• The type of soil used for planting.

• The amount of water each plant receives.

• The amount of sunlight each plant receives.

• The size of the pots used for planting.

In an experiment, what is the control group?

• The group that receives the experimental treatment.

• The group that does not receive the experimental treatment and is used as a benchmark to measure how the other tested subjects do.

• The group that is exposed to a different variable than the experimental group.

• The group that is randomly selected from the population for the experiment.

How can you determine if an experiment is valid?

• An experiment is valid if it accurately tests the hypothesis and controls for other variables, leading to reliable results.

• An experiment is valid if it is conducted in a laboratory setting only.

• An experiment is valid if it produces results that are popular among scientists.

• An experiment is valid if it is repeated multiple times without any changes.

What is an example of a dependent variable in a plant growth experiment?

• The amount of sunlight the plants receive

• The type of soil used for planting

• The height of the plants after a certain period

• The number of leaves on the plants

What is a hypothesis in the context of an experiment?

• A hypothesis is a guess about the outcome of an experiment.

• A hypothesis is a testable prediction about the relationship between the independent and dependent variables.

• A hypothesis is a statement that cannot be tested.

• A hypothesis is a conclusion drawn from experimental data.

What is a dependent variable?

• A variable that is manipulated in an experiment.

• A factor that is measured or observed in an experiment, which is affected by changes in the independent variable.

• A constant that remains unchanged throughout the experiment.

• A variable that does not affect the outcome of the experiment.