An educated guess,

Students of different ages were given puzzles to put together and timed on quickly they did so.

What is the relationship of the frequency of brushing your teeth to the number of fillings you have?

Also known as the independent variable.

Six azaela used in a study; 3 received fertilizer and 3 got only water.

The experimentor changes this in an experiment

Does different tire treads effect the braking distance?

The temperature of the water was measured at different depths of the lake.

First step in the scientific method.

The CDC is testing a new pain relief drug. They test 100 people with back problems. 50 get a placebo and 50 get a pain relief pill.

The evidence gathered during observation.

the higher the temperature of air in the oven the faster the cake will bake.

The amount of time you study will have a positive difference on your next test score.

Also known as the dependent variable.

20 fifth graders were tested on quick they could finish long division: 10 were given calculators and 10 were not.

Changes because of the independent variable. Is measurable

Lemon trees receiving the most water produces the most lemons.

What are the effects of different sunblock SPF factors on sunburn?

Data way outside a pattern of results.

Will temperature effect how fast milk will go bad. 1 cup in fridge, 1 cup outside and 1 cup at room temperature.

A standard to compare the results of an experiment.

The pollution produced by cars was measured from vehicles using gasoline with different amounts of lead

The amount of time you spend instant messaging will effect students grades.

A brief overview of an investigation (experiment).

What happens if you add more water to a cake recipe?.