In an experiment Jackson tested to see how the size of rocks affect the amount of dirt that washes away when water flow downhill. Which variable is manipulated?

Sandy is conducting an investigation to find out which food his dog likes best. Which is the manipulated variable in his investigation

A student asked, Do objects float better in fresh water or salt water? What is the best hypothesis that matches this experiment.

A student wanted to know which brand of mouthwash killed the most germs. Which part of the experiment should be kept constant?

A student asked How does the expectation of being tickled affect someone? What statement is the best hypothesis for this experiment?

A student tested the Jumbo white marshmallows and the Gooey-tooey marchmallows to see which type melted the fastest. What is the dependent variable?

Three football players investigate to see who can throw a football the farthest. They mark off an area on the field for their investigation. What should they keep constant?

A student conducted an experiment which tested the effect a ramps surface would have on the distance a toy car travels. She covered one ramp in sandpaper, one with oil, one with cloth, and one was left uncovered. What is the independent variable?

Which example is an hypothesis written in the correct format

If I use foam padding in a box, then (it will absorb the sound waves) What is the part of the hypothesis in parenthesis?

If I plant a bush in a shaded area and a well lit area, then the bush in the well lit area will have more growth. What would be considered the constant?

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