Designing a Controlled Experiment FA

How does the distance from this eye chart affect the number of letters visible on a line? What's the independent variable?

• Distance

• Number of letters read

• Eye chart

• None

How does the amount of oxygen in the water affect oyster size? Independent variable?

• The size of the oysters

• The color of the oyster shell

• Amount of oxygen in the water

• Amount of water

How does the distance from this eye chart affect the number of letters visible on a line? What's the Dependent Variable?

• The distance from chart

• Number of letters read accurately

• Color of text in the chart

• Font of text

How does the amount of oxygen in the water affect oyster size? What's the Dependent variable?

• The size of the oysters

• The color of the oyster shell

• Amount of oxygen in the water

• Amount of water

How does the amount of oxygen in the water affect oyster size? Which is an example of a standardized variable? Check all that apply

• The size of the oysters

• The type of oyster

• Amount of oxygen in the water

• Amount of water

50 weightlifters are given vitamin supplements before they lift and 50 different weightlifters are given no supplements and change in muscle mass is recorded after 4 months. Which of the following would be the constants (standardized variables) for this experiment? (Bubble all that are true)

• amount and type of food eaten during day

• % increase in muscle mass

• amount of supplement given

• type of exercise

• being given supplements or not

Water fleas are placed in 40°C water and 20^oC water and their heart rates are recorded. What is the independent variable?

• heart rate

• temperature of water

• # of water fleas

• type of liquid

• type of flea

The part of the experiment that does not contain the independent variable. Used for comparison.

• Control Group

• Experimental Group

• Results

• Data

What is the effect of salt water on the average of the 3 tallest blades of grass?
The above question is an example of:

• Hypothesis
• Conclusion
• Experiment
• Problem

Which group in an experiment is treated with the independent variable?

• control group
• experimental group
• hypothesis
• dependent variable