scientific_method_worksheet_-_spongebob

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1 Scientific Method: Controls and Variables – Part 1 Name: ________________________ SpongeBob and his Bikini Bottom pals have been busy doing a little research. Read the description for each experiment and answer the questions. 1 – Patty Power Mr. Krabbs wants to make Bikini Bottoms a nicer place to live. He has created a new sauce that he thinks will reduce the production of body gas associated with eating crabby patties from the Krusty Krab. He recruits 100 customers with a history of gas problems. He has 50 of them (Group A) eat crabby patties with the new sauce. The other 50 (Group B) eat crabby patties with sauce that looks just like new sauce but is really just a mixture of mayonnaise and food colouring. Both groups were told that they were getting the sauce that reduce gas production. Two hours after eating the crabby patties, 30 customers in group A reported fewer gas problems and 8 customers in group B reported having fewer gas problems. Which people are in the control group? What is the independent variable? What is the dependent variable? What should Mr. Krabs ’ conclusion be? Why do you think 8 people in group B reported feeling better? 2 – Marshmallow Muscles Larry was told that a certain muscle cream was the newest best thing on the market and claims to double a person ’ s muscle power when used as part of a muscle-building workout. Interested in this product, he buys the special muscle cream and recruits Patrick and SpongeBob to help him with an experiment. Larry develops a special marshmallow weight-lifting program for Patrick and SpongeBob. He meets with them once every day for a period of 2 weeks and keeps track of their results. Before each session, Patrick ’ s arms and back are lathered in the muscle cream, while SpongeBob ’ s arms and back are lathered with the regular lotion. Which person is in the control group? What is the independent variable? What is the dependent variable? What should Larry ’ s conclusion be? What questions still remain? Are there any confounding variables? How would you improve this experiment? Time Patrick SpongeBob Initial Amount 18 5 After 1 Week 24 9 After 2 Weeks 33 17

2 3 – Slimotosis SpongeBob notices that his pal Gary is suffering from slimotosis, which occurs when the shell develops a nasty slime and gives off a horrible odour. His friend Patrick tells him that rubbing seaweed on the shell is the perfect cure, while Sandy says that drinking Dr. Kelp will be a better cure. SpongeBob decides to test this cure by rubbing Gary with seaweed for 1 week and having him drink Dr. Kelp. After a week of treatment, the slime is gone and Gary ’s shell smells better. What was the initial observation? What is the independent variable? What is the dependent variable? What should SpongeBob ’s conclusion be? What questions still remain? Are there any confounding variables? How would you improve this experiment? 4 – Microwave Miracle Patrick believes that fish that eat food exposed to microwaves will become smarter and will be able to swim through a maze faster. He decides to perform an experiment by placing fish food in a microwave for 20 seconds. He has the fish swim through a maze and records the time it takes for each one to make it to the end. He feeds the special food to 10 fish and gives regular food to 10 others. After 1 week, he has the fish swim through the maze again and records the times for each. What was Patrick ’ s hypothesis? Which fish are in the control group? What is the independent variable? What is the dependent variable? Look at the results in the charts. What should Patrick ’ s conclusion be? After doing the experiment and crunching the numbers, Patrick is still not sure about his conclusion. What could he do to be more confident in his results? What questions still remain? Are there any confounding variables? How would you improve this experiment? Special Food Group (time in minutes: seconds) Regular Food Group (time in minutes: seconds) Fish Before After Fish Before After 1 1:06 1:00 1 1:09 1:08 2 1:54 1:20 2 1:45 1:30 3 2:04 1:57 3 2:00 2:05 4 2:15 2:20 4 1:30 1:23 5 1:27 1:20 5 1:28 1:24 6 1:45 1:40 6 2:09 2:00 7 1:00 1:15 7 1:25 1:19 8 1:28 1:26 8 1:00 1:15 9 1:09 1:00 9 2:04 1:57 10 2:00 1:43 10 1:34 1:30

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