1. Clear off table except for lab safety notes/rules/notebook2. Lab safety quiz3. Begin experimental design

HAPPY FRIDAY!!!!

Don’t say anythingExamine the pictureIn a moment, I will ask you to share your observations

INSTRUCTIONS

DESIGN

Step 1: Make observationsStep 2: Ask a questionStep 3: Make a hypothesisStep 4: Set up an experimentStep 5: Analyze the dataStep 6: Repeat experimentStep 7: Draw conclusion

THE PROCESS

constants

all factors which are NOT allowed to change during the

experiment

A variable is something that changes.

There are 2 types of variables:

Independent variableDependent variable

independent independent variablevariable

the variable that is changed on purpose by the

experimenteraka cause, stimulus, reason, manipulated variable, etc.

This is the ‘’if” part of a hypothesis.

is on the X-axis of a graphis on the X-axis of a graph

X-Axis

dependent variabledependent variable

the variable that responds

aka effect(s), result(s), aka effect(s), result(s), responding variable, etc. responding variable, etc. This is the ‘’then” part of a

hypothesis.

is on the Y-axis of a graphis on the Y-axis of a graph

X-Axis

Y-AxisTitle: Independent Var. vs. Dependent Var.

repeated trials

the number of times the experiment is repeated

The more times you repeat the The more times you repeat the experiment, the more VALID your experiment, the more VALID your

results are.results are.

Hypotheses are tentative and testable statements Hypotheses are supported or not supported by observational evidencetheories are based on natural and physical phenomena and are capable of being tested by multiple independent researchers

THEORIES VS. HYPOTHESES