Year 9 Revision Variables

What are variables in an experiment?

Elements that can change in an experiment.

What is an independent variable?

The variable that is intentionally changed or manipulated.

What does the dependent variable measure?

It measures what is being tested in the experiment.

What are control variables?

Factors that must remain constant throughout the experiment to ensure valid results.

In the Water Rocket Experiment, what is the independent variable?

Angle of the slope.

In the Ball Drop Experiment, what is the dependent variable?

Height that the ball bounces.

What controls the conditions in the Current and Temperature Experiment?

Type of wire used.

What type of graph is used for continuous variables?

Line Graph.

What is the purpose of fully labeling a graph?

To clearly communicate what the axes and title represent.

What is the first step in calculating a mean?

Add all results together.

When calculating the mean of a set of numbers, what do you do after adding the results?

Divide the total by the number of results.

What does the 'mean' represent in data analysis?

The average value of a set of numbers.

What is the mean size of lichens based on given results?

6.21 cm.

In the Dissolving Magnesium Strip experiment, what total time results in the mean?

37.6 seconds.

What should be done if one result significantly differs from other results when calculating a mean?

It may be untrustworthy and excluded from the mean calculation.