Hypothesis and Variables Forming a Hypothesis n Hypothesis
Hypothesis and Variables
Forming a Hypothesis n Hypothesis- a testable explanation of an observation. n A hypothesis is NOT just an educated guess about what you think will happen. It must be able to be tested!
Forming a Hypothesis n We write the hypothesis in an If-Then statement ex: If the amount of fertilizer is increased, then the height of the plant will increase.
Variables & Controls n A variable is anything that changes in a scientific experiment. n The control is what you use to compare the results to in the end of the experiment.
There are 2 types of variables: Independent n Dependent n
Forming a Hypothesis § The Independent Variable goes after the “If” I. V. If the amount of fertilizer is increased, then the height of the plant will increase.
Forming a Hypothesis § The Dependent Variable goes after the “Then” If the amount of fertilizer is increased, then the height of the plant will increase. D. V.
Now You Try: n If you spend more time studying, then your grade will improve. Independent Variable = n Dependent Variable = n
Now You Try: n If you spend more time studying, then your grade will improve. Independent Variable = amount of time spent studying n Dependent Variable = grade n
Now You Try: n If the temperature of the room is increased, then the bacteria will grow faster. Independent Variable = n Dependent Variable = n
Now You Try: n If the temperature of the room is increased, then the bacteria will grow faster. Independent Variable = temperature of room n Dependent Variable = bacterial growth n
Variables & Controls n A variable is anything that changes in a scientific experiment. n The control is what you use to compare the results to in the end of the experiment.
2 Types of variables: n Independent Variable: What you change. n Dependent Variable: What changes because of the Independent Variable.
2 Types of variables: n Independent Variable: Cause n Dependent Variable: Effect
Independent Variable n Independent Variable: What you change. ¨ Cause ¨ a. k. a Manipulated Variable ¨ Graphed on x axis
Dependent Variable n Dependent Variable: What changes because of the Independent Variable. ¨Effect ¨a. k. a Responding Variable ¨Graphed on y axis
Independent Variable vs. Dependent Variable Independent Variable Also Known As: Manipulated Variable Dependent Variable Responding Variable Results: Cause Effect On a graph: X axis Y axis
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