Presentation on theme: "Aim: How to test a hypothesis and design an experiment Do Now: 1) What do you need to know in order to test your hypothesis? 2)Take out your homework."— Presentation transcript:
1 Aim: How to test a hypothesis and design an experiment Do Now: 1) What do you need to know in order to test your hypothesis? 2)Take out your homework.Homework: do “Simpsons: Identify the Controls and Variables”. Check on DAEDalus.
2 The Design of Scientific Experiments An experiment is a set of procedures that scientists follow to gain knowledge about the world.It is a procedure used to test a hypothesis.
3 Questions to ask before designing experiment Does my experiment answer the question I'm trying to solve?Does it adequately test my hypothesis?Can I make observations about the results of my experiment, and will I be able to analyze those results?Finally, if I run this test, will it allow me to come up with some kind of conclusion?
4 What an Experiment Needs Rule #1: The experiment must show that a hypothesis is either supported or not supported.Rule #2: The results of an experiment must be measurable and objective.Rule #3: The experiment must be repeatable by other scientists.
5 Steps to Designing an Experiment to Test Your Hypothesis 1. Present Hypothesis2. Make predictionWhat would be true if the Hypothesis were true?3. Write the Experimental ProcedureA good procedure provides enough detail that someone can replicate the process4. Identify the Independent and Dependent Variables
6 Steps cont. 5. Design the Experiments “What can I do that will give me one result if my hypothesis is true, and a different result if my hypothesis is false?”6. Experimental Group vs. Control GroupExperimental Group: Trials where the independent variable is changedControl Group: All the trials where the independent variable is in its natural state7. Repeat experiment
7 Testing a Hypothesis Activity 1. Presenting Hypothesis: Write down the proposed hypothesis.2. Making predictions: For each hypothesis, ask yourself what would be true if the hypothesis were true.3. Designing Experiments: Design one experiment that tests your hypothesis using the predictions you made from step 2.