Presentation on theme: "“What are the steps of the scientific"— Presentation transcript:
1 “What are the steps of the scientific method?”Objectives:1. Recognize that a scientific study always begins withqualitative/quantitative observations.2. Understand that a hypothesis represents a tentative explanation for the initial observation.3. Realize that an experiment is necessary to test a hypothesis;understand the distinction between dependent and independentvariables, as well as the importance of a control in an experiment.4. Recognize the importance of data analysis in reaching a conclusionthat can either support or disprove the hypothesis.5. Distinguish among law, theory and inference.
2 Scientific Method 1. Define the scientific method. 2. List the steps of the scientific method.3. What is the difference between an independent and a dependent variable?4. What is a control group and why should it be included in all experiments?5. Why is it important to have more than a couple of experimental subjects?
3 Scientific Method Group # of Coughs/hr # Tsp of Syrup A 20 3 B 25 2 C Lucy has made somehomemade cough syrup.She believes that people willcough the least if they take2 teaspoons of the coughsyrup every 4 hours. Herdata is in the following table.Group# of Coughs/hr# Tsp ofSyrupA203B252C301D401. What is the hypothesis?2. What is the independent variable?3. What is the dependent variable?4 Which group is the control group?5. What should Lucy’s conclusion be?
4 Scientific Method Group Brand of Bug Spray # of mosquito bites 1 A 4 2 73CNone151. What is the hypothesis? 2. What is the dependent variable? 3. What is the independent variable? 4. Which group is the control group? 5. What should Quinten’s conclusion be?Quinten wanted to know which bug spray is the best at repellingmosquitoes. He decided to test three brands of bug spray repellantthat he labeled A, B, and C. Quinten had always used brand A in thepast, so he believed that it would repel mosquitoes the best. Hedecided to measure the number of mosquito bites that people usingthese brands got. He applied the same amount of bug spray to eachperson and placed them in rooms containing the same number ofmosquitoes. After an hour, he counted how many mosquito bites eachperson had gotten.
5 Scientific Method You notice that your houseplant is dying. You want to figure outhow to make it healthyagain.Design an experimentto determine what iswrong.1. State your hypothesis.2. What is your independent variable?3. What is your dependent variable?4. What will be your control group?