Download presentation
Presentation is loading. Please wait.
Published byKathryn Daniella Glenn Modified over 9 years ago
1
Catalyst (4 min) 1. Why is it important to communicate your results after you perform a lab experiment? 2. What do we do if our results do not support our hypothesis?
2
Where are we? Last week: Observation How we collect data in the lab Yesterday: Scientific Method How we solve problems in the lab Today: Experiment Design How we design a procedure to solve problems
3
Experiment Design 9/21/10
4
Elements of a good experiment Control Independent Variable Dependent Variable Beriberi Scientists thought bacteria caused Beriberi Injected a group of chickens with bacteria Left one group of chickens alone Observed which chickens got sick
5
Independent Variable A change caused by the scientist Beriberi Scientists thought bacteria caused Beriberi Injected a group of chickens with bacteria Left one group of chickens alone Observed which chickens got sick
6
Dependent Variable A variable whose value depends upon the independent variable What we observe in the lab Beriberi Scientists thought bacteria caused Beriberi Injected a group of chickens with bacteria Left one group of chickens alone Observed which chickens got sick
7
Control The standard that is used for comparison Beriberi Scientists thought bacteria caused Beriberi Injected a group of chickens with bacteria Left one group of chickens alone Observed which chickens got sick
8
Constant Something that is held the same throughout the experiment In order to make sure we know exactly what’s causing a change, we can only alter one variable at a time! Examples The number of chickens The amount of bacteria injected What all of the chickens ate
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.