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Scientific Method

Scientific Method. Biology 1B Mrs. Yanac. Process to Solve Problems. Ask a Question / Identify a Problem Research Make a Hypothesis Design an Experiment Organize & Analyze Data Make a Conclusion Repeat OR Change Hypothesis/Experiment. Experiment. Control

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Scientific Method

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  1. Scientific Method Biology 1B Mrs. Yanac

  2. Process to Solve Problems • Ask a Question / Identify a Problem • Research • Make a Hypothesis • Design an Experiment • Organize & Analyze Data • Make a Conclusion • Repeat OR Change Hypothesis/Experiment

  3. Experiment • Control • Not exposed to treatment (stays the same) • Independent Variable (Manipulated Variable) • What is being tested • Scientist controls this • Dependent Variable (Responding Variable) • What happens as a result of what the scientist did COPY THESE INTO YOUR VOCAB BOOK

  4. Valid Experiment Other things that need to be considered” • Sample size • Number of items tested • Trials • Number of times experiment repeated • Minimum of 3 trials required for an average Sample size Trials & vice versa

  5. Patty Power • Mr. Krabbs wants to make Bikini Bottom 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 KrustyKrab. • 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 mixture of mayonnaise and food coloring. • Both groups were told that they were getting the sauce that would reduce gas production. • Two hours after eating the crabby patties, 30 customers in group A reported having fewer gas problems and 8 customers in group B reported having fewer gas problems.

  6. Patty Power • What was the Control Group? • Group B • What was the Independent Variable? • New sauce • What was the Dependent Variable? • Amount of gas • What should Mr. Krab’s conclusion be? • The new sauce appears to work as it reduced the amount of gas produced in 60% of the people. • Why did 8 people in Group B report less gas? • Placebo effect

  7. 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 odor. • 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.

  8. Slimotosis • What was SpongeBob’s Initial Observation? • Slimotosis on Gary’s shell • Independent variable? • Cures – Seaweed & Dr. Kelp • Dependent variable? • Slime & odor • SpongeBob’s conclusion? • Gary’s symptoms disappeared BUT SpongeBob can not be sure which cure worked. • Redo experiment, testing only one variable at a time.

  9. 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 back are lathered with the muscle cream & SpongeBob is lathered with regular lotion.

  10. Marshmallow Muscles Results

  11. Marshmallow Muscles • Control Group • SpongeBob • Independent variable • Muscle Cream • Dependent variable • Amount of marshmallows lifted (strength) • Larry’s conclusion • Muscle cream claims not true since both Patrick & SpongeBob improved. Muscle improvements due to Larry’s special workout.

  12. Microwave Miracle • Patrick believes that fish that eat food exposed to microwaves will become smarter and would 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.

  13. Microwave Miracle Special Food Group Time (minutes/seconds) Regular Food Group Time (minutes/seconds)

  14. Microwave Miracle • Patrick’s Hypothesis • Feeding fish microwaved food would make them become smarter • Control Group • Fish that eat regular food • Independent variable • Microwaved food • Dependent variable • Time required to complete maze • Patrick’s conclusion • The special food does not appear to be a big factor in helping fish become smarter

  15. Let’s look at some more…Open your binders

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