Biology 1510 Aug.22 – Scientific Method 8/22/2012 11:12:00 AM
an educated guess
2 Critical elements
Can only say that the data SUPPORTS your hypothesis
Can’t say that your hypothesis is correct
Experiment needs to have 2 or more outcomes
Start off with doing some research
Then test it
Literature search (research)
Ex: Does color warn predators?
Design and Experiment
Predication leads to
o If/Then Experiment
o Ex: If brightly colored snakes warn predators, then less will
Ex: Brightly colored snakes warn predators.
This is known as the alternative hypothesis
Ex: Have clay snakes. One is brightly colored the other is not. See
how predators respond to each.
Independent variable: experimenter manipulated this variable
Dependent variable: what you measure (response variable)
Ex: Model Color (Ind