1. Bell Work Sept 1, 2015 SPI 0807.Inq.1 (Variables and Controls) 1.Three red trees are kept at different humidity levels inside a greenhouse for 12 weeks. One tree is left outside in normal conditions. Height of the tree is measure once a week. What is the independent, dependent, and controlled variables. 2.What equipment do you use to find mass? 3.What are the units to mass? 4.Find the Density if the mass of a cube is 10 g and each side is 5cm.

2. SPI 0807.Inq.1 (Variables and Controls) Today's Plan Plan 1) Explain/Discuss bellwork 2) Emphasize objective(s) 3) Review Variables 3)Variables worksheet You must turn the worksheet in before you leave. It will be CHECKED for a grade!! WRITE THIS IN YOUR AGENDA! Homework: NONE Science

3. In an experiment…  …you should only test for ONE key thing at a time When you repeat the experiment…  …only change this ONE key thing This one thing is called… Notes SPI 0807.Inq.1 (Variables and Controls) Independent Variables

4. Notes SPI 0807.Inq.1 (Variables and Controls) Science What Is A Dependent Variable?  Often called the "responding variable" because it is the response to the factor that was previously introduced  These are the results that you observe after you introduced the independent/manipulated variable  In other words, anything that "changes on its own" while the experimenter is observing it will be a… Also called "Responding Variable"

5. Notes SPI 0807.Inq.1 (Variables and Controls) Science What Is A Contolled Variable?  In an experiment, the control variable is something that is constant and unchanged.  Further, a control variable strongly influences values; it is held constant to test the relative impact of independent variables.  In other words, if not held constant it will affect your results and make them invalid.