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DO NOW – Level 0

DO NOW – Level 0. Pass in Cornell Notes Homework Read “Risk Taking” Article. Identifying Variables & Designing Investigations. Cause and Effect. Relationship between two things when one thing makes something else happen

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DO NOW – Level 0

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  1. DO NOW – Level 0 • Pass in Cornell Notes Homework • Read “Risk Taking” Article

  2. Identifying Variables&Designing Investigations

  3. Cause and Effect • Relationship between two things when one thing makes something else happen • Scientists use an experiment to search for cause and effectrelationships • Experiments are made so that changes to one item cause something else to vary or change in a predictable way

  4. Example • Does eating a McDonald’s Big Mac everyday cause people to be obese? What is the cause and effect relationship? Which variable may CAUSE something else to happen? Which is changing due to the other one?

  5. Testable questions • Turn cause and effect into something that can be tested  They make a testable question • Testable Questions: • Not based on opinion • Must have clear cause and effect relationship • Must be measurable

  6. Does eating a McDonald’s Big Mac everyday cause people to be obese? NOT TESTABLE Let’s make it testable: • Does it have clear cause and effect? _________ • Is it based on opinion? _________ • Is it measurable? _______ • How can we make it measureable? • ______________________________________ Yes No No Explain what we will measure

  7. Testable question • What is the effect of eating a McDonald’s Big Mac every day on a person’s weight?

  8. Your turn • Write TQ next to each question that can be tested. • For the TQ’s circle the factor CAUSING something to change • And underline the EFFECT • For those that are not TQ’s, write why they are not testable

  9. TQ or NOT • Which type of music is better Hip Hop or Punk? • Does reading 30 minutes each night help your grades? • Will eating protein shakes increase my upper body strength? • Which brand of shoe is better for running, Nike or Adidas? • Does fertilizer help a plant grow taller?

  10. Experimental Variables • Independent Variable – something that is changed by the scientist • What is being tested • What is manipulated/changed • What we think may cause something to happen

  11. What is the effect of eating a McDonald’s Big Mac every day on a person’s weight? Independent Variable??? IV = Amount of Big Macs that someone eats

  12. Experimental Variables • Dependent Variable – something that might be affected by the change in the independent variable • What is observed • What is measured • The data collected during the investigation

  13. What is the effect of eating a McDonald’s Big Mac every day on a person’s weight? Dependent Variable??? DV = Person’s Weight in (kg)

  14. Experimental Variables • Controlled Variable – a variable that is not changed, kept the same or constant • Also called constants • Allow for a “fair test”

  15. For Example:

  16. Students of different ages were given the same jigsaw puzzle to put together. They were timed to see how long it took to finish the puzzle.

  17. Identify the variables in this investigation.

  18. What was the independent variable? • Ages of the students • Different ages were tested by the scientist

  19. What was the dependent variable? • The time it to put the puzzle together • The time was observed and measured by the scientist

  20. What was a controlled variable? • Same puzzle • All of the participants were tested with the same puzzle. • It would not have been a fair test if some had an easy 30 piece puzzle and some had a harder 500 piece puzzle.

  21. Another example:

  22. The higher the temperature of water, the faster an egg will boil.

  23. Independent variable – temperature of water • Dependent variable – time to cook an egg

  24. Last one:

  25. The temperature of water was measured at different depths of a pond.

  26. Independent variable – depth of the water • Dependent variable – temperature

  27. Designing Investigations

  28. The greater the amount of soap in a soap and water mixture, the bigger a soap bubble can be blown. • Design an investigation to test this hypothesis. • Identify the variables • What exactly will be changed? How will it be changed? • What exactly will be measured? How will it be measured?

  29. The farther a ball drops, the higher it will bounce. • Design an investigation to test this hypothesis. • Identify the variables • What exactly will be changed? How will it be changed? • What exactly will be measured? How will it be measured?

  30. http://www.youtube.com/watch?v=tG5NX7fC8VM&p=F515918DB6082821&playnext=1&index=15http://www.youtube.com/watch?v=tG5NX7fC8VM&p=F515918DB6082821&playnext=1&index=15 What color do Sharks prefer?

  31. While watching video: • What is the IV • Remember: this is the variable that is being changed • What is the DV • This is the variable that is being measured • What is the testable question?

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