Scenario #3
What is Al's independent variable?
adding salt to water
What is Christian's dependent variable?
The time it takes the car to roll down the ramp
What is the scientist's independent variable?
The amount of water the cattails receive
Identify the two groups in a controlled experiment.
Control and Experimental
Identify #1.
Body tube
What is Al's dependent variable?
freezing time of water
What is Christian's hypothesis?
If a cart is heavier, then it will travel down a ramp faster.
What is the scientist's dependent variable?
The growth of the plants
Identify the three variables in a controlled experiment.
Independent, Dependent, and Controlled
Identify #8.
Light
What is Al's hypothesis?
If there is salt in water, then it will freeze more quickly.
Identify a controlled variable in Christian's experiment.
Answers may vary. The cart, the ramp, etc.
25 per group; same type of soil; same amt. of sunlight; same temperature
Sally has just completed her experiment. If she is correctly following the scientific method, what should she do next?
Collect and Analyze Data
Identify #12 and #13.
Coarse and Fine Adjustment Knobs
Identify Al's control group.
The ice tray that is filled with only distilled water
How could have Christian's experimental procedure have been improved?
Repeating the trials with the increasing weights
How do we know that the scientist's results are reliable?
The scientist repeated the experiment using 100 more cattails.
How many variables should be changed in a controlled experiment? Explain your answer.
1; in order to know what caused the results
Which objective should you start on when looking at a slide?
the lowest, usually 4x
Identify the type of data Al collected in this experiment.
Qualitative
Does the data from Christian's experiment support his hypothesis?
No
What conclusion can you draw from the scientist's results?
If cattails receive more water, they will increase in growth.
How many experimental groups can you have in a controlled experiment? Explain.
There is no limit to the number of experimental groups you can have in an experiment, as long as there is a control group for you to compare those groups to.
Calculate the total magnification if the objective used on the microscope was 10x.
100x