pg. 10 Write: STARTER (and give your answer, do not write the prompt) Scientists are split between whether or not contacts help protect the eye more in the event of a lab accident. Using COMPLETE SENTENCES, give your opinion on this matter

Table of Contents Date Lecture/ Activity/ Lab Page Grade 8/28 Safety Contract 5 8/28 Plan for Success 6-7 8/28 Types of Graphs 8 8/29 Lab Equipment Notes 9 8/30 Starter/Exit 10 8/30 Experimental Design Notes 11

Title page 11:

A variable is something that changes. *note: only 1 variable should be tested per experiment**

6 concepts of experimental design independent variable independent variable dependent variable dependent variable constants control group control group experimental group repeated trials repeated trials

constants all factors which are NOT allowed to change during the experiment

control group control group (standard) the group (standard) to which everything is compared nothing different or special is done to this group (standard) the group (standard) to which everything is compared nothing different or special is done to this group

experimental group experimental group the group(s) being tested with the independent variable Each test group has only ONE FACTOR different from the other test groups:the independent variable.

repeated trials repeated trials The more times you repeat the experiment, the more VALID your results are

hypothesishypothesis Independent Variable Dependent Variable + verb If independent variable + verb,then dependent variable + verb. Hypothesis V Chart Hypothesis V Chart

independent variable the variable that is changed on purpose by the experimenter You have complete control over this This is the ‘’if” part of a hypothesis.

independent variable M anipulated by you I ndependent Variable is one you control X -axis of the graph is where you put this info M.I.X.

dependent variable the variable that responds this is your data This is the ‘’then” part of a hypothesis.

dependent variable D.R.Y. D ependent R esponding variable Y -axis of a graph is where you put this info

Once you decide what you want to test, you must determine how to manage everything else.

is used to design an experiment. IVCDV The chart

iv dv constants fertilizerfertilizer The variable (factor) that you will change is the independent variable. 0 drops 2 drops 4 drops 6 drops

iv dv constants plant growth fertilizerfertilizer 0 drops 2 drops 4 drops 6 drops

iv dv constants plant growth fertilizerfertilizer amt. of water type of soil type of plant type of planter size of planter amt. of soil type of light locationlocation 0 drops 2 drops 4 drops 6 drops These are the factors that must NOT change during experimentation. They must remain constant.

no fertilizer 2 drops fertilizer 4 drops fertilizer 6 drops fertilizer

no fertilizer 2 drops fertilizer 4 drops fertilizer 6 drops fertilizer What is this called? CONTROL What are these called? EXPERIMENTAL GROUP

What are these called? CONSTANTS

What is this called? The plant growth that you observe here can be called... the results (of adding fertilizer) the response (to adding fertilizer) the effects (of adding fertilizer) dependent variable

What do you do if you want to test the type of soil instead of fertilizer? iv dv constants plant growth fertilizerfertilizer amt. of water type of plant type of planter size of planter amt. of soil type of light locationlocation type of soil Type of soil becomes the IV. Fertilizer becomes a constant. fertilizerfertilizer

EXIT: Write your own hypothesis and create a sample IV C DV chart like the one in your notes. Questions?? Just ask :)