1. How does the distance from an eye chart affect the number of letters that are recognized on a line?
Constant/Controlled variables: Eye chart, position of viewer and the light in the room.
2. How does the amount of light affect the growth of a plant?
Constant/Controlled variables: Type of plant, amount of water, type/amount of soil
3. How does the amount of oxygen in the water affect the oyster population?
Constant/Controlled Variables: Temperature of water, location, time of year.
4. How will the amount of fertilizer used on a field affect the number of earthworms found there?
Constant/Controlled Variables: type of soil, temperature, amount of water.
5. How does the length of a string affect the number of times a pendulum will swing back and forth in ten seconds?
Constant/Controlled Variables: mass of pendulum, distance pulled back, height of pendulum
6. How does the size of a bicycle tire affect the distance it will travel when it is pedaled in a given number of times?
Constant/Controlled Variables: inflation of tire, force of pedal, terrain (grass vs. blacktop)
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Hope this helped :) You can find out the Hypothesis/Prediction on your own from the other things I've included. It will make it look like your own work better that way.
