| A | B |
|---|
| In an experiment to see which type of fertilizer causes plants to grow the fastest, the growth of the plant is the __________ variable. | dependent (the growth of the plant depends on the type of fertilizer) |
| In an experiment to see which type of fertilizer causes plants to grow the fastest, the type of fertilizer is the _____ variable. | independent (the fertilizer does not depend on the growth of the plant) |
| The variable that is changed by the researcher before an experiment starts (such as the amount of water a plant will be receiving) is known as the ____ variable. | independent |
| The variable that is measured during the experiment to determine the results (such as the height that a plant grows during the experiment) is known as the ______ variable | dependent |
| In a controlled experiment there is only one ______ variable. | independent |
| For an experiment to be considered "controlled" there must be exactly _____ independent variable(s). | one |
| If a drug company was trying to find out whether a new medicine kept you from getting sick, half of the test subjects would get the medicine and the other half would get a fake pill but not know they were getting a fake pill. This last group would be considered the _____ group. | control |
| In an experiment where you are trying to find out how bright indoor grow lights should be in order to cause the best plant growth, things like temperature, the amount of water, and the type of soil used are considered to be ____. | controlled variables (constants) |
| In an experiment to test the best method for treating AIDS, 1000 people got a drug called AZT, 1000 people got AZT plus interferon, and a third group of 1000 got a sugar pill that they thought was medicine. What is the sample size in this study? | 1000 (remember, the sample size is the number of test subjects used in one group during one trial) |
| In a plant experiment, 50 plants got 10 mL of water per day, 50 plants got 20 mL per day, and 50 plants got 30 mL per day. After the experiment was finished, it was repeated once to see if similar results could be obtained. How many trials were conducted? | Two (the test was run start to finish once and then it was repeated once more) |
| Another word for the independent variable is the ________ variable. | manipulated |
| Another word for the manipulated variable is ________ variable | independent |
| Another word for the dependent variable is ________ variable | responding |
| Another word for the responding variable is ________ variable. | dependent |
| Another word for the controlled variables is _________. | constants |
| Another word for the constants is ________ . | controlled variables |
