Bell Ringer 92012 List the control hypothesis independent

Bell Ringer – 9/20/12 List the control, hypothesis, independent variable and dependent variables of the following experiment. Janine decides to test the which type of household cleaner will kill the most bacteria because her mother always uses bleach and thinks it kills all bacteria and germs. She cleans a small section of a dirty counter with the following cleaners: vinegar, soap and bleach. She leaves a small section dirty. Next, she takes a sample from each section and tests it under a microscope to find the amount of bacteria in each section. The bleach has a lot less bacteria than the unclean section and the vinegar has almost the same amount. The amount of bacteria on the soap falls between the vinegar and the bleach, but is definitely less than the unclean section.

AGENDA Bell Ringer Finish Simposons Control WS Go over Review Worksheets Review!

OBJECTIVE Understand analyze characteristics of living things Understand analyze science of life Understand analyze different areas of experiments and scientific method

DEFINE THE FOLLOWING: Control: In a controlled experiment, the group that is NOT receiving the factor being tested Independent ONE factor that can be Variable: The changed in a controlled experiment; it is the factor tested and affects the experiment outcome Dependent Variable: The factor being measured in a controlled experiment; its value changes because of changes to the independent variable

SIMPSONS WORKSHEET Smithers thinks that a special juice will increase the productivity of workers. He creates two groups of 50 workers each and assigns each group the same task (in this case, they're supposed to staple a set of papers). Group A is given the special juice to drink while they work. Group B is not given the special juice. After an hour, Smithers counts how many stacks of papers each group has made. Group A made 1, 587 stacks, Group B made 2, 113 stacks. Identify the: 1. Control Group 2. Independent Variable 3. Dependent Variable 4. What should Smithers' conclusion be? 5. How could this experiment be improved? 6. What was the initial observation?

SIMPSONS WORKSHEET Homer notices that his shower is covered in a strange green slime. His friend Barney tells him that coconut juice will get rid of the green slime. Homer decides to check this out by spraying half of the shower with coconut juice. He sprays the other half of the shower with water. After 3 days of "treatment" there is no change in the appearance of the green slime on either side of the shower. Identify the 7. Control Group 8. Independent Variable 9. Dependent Variable 10. What should Homer's conclusion be?

SIMPSONS WORKSHEET Bart believes that mice exposed to radiowaves will become extra strong (maybe he's been reading too much Radioactive Man). He decides to perform this experiment by placing 10 mice near a radio for 5 hours. He compared these 10 mice to another 10 mice that had not been exposed. His test consisted of a heavy block of wood that blocked the mouse food. he found that 8 out of 10 of the radiowaved mice were able to push the block away. 7 out of 10 of the other mice were able to do the same. Identify the 11. Control Group 12. Independent Variable 13. Dependent Variable 14. What should Bart's conclusion be?

SIMPSONS WORKSHEET Krusty was told that a certain itching powder was the newest best thing on the market, it even claims to cause 50% longer lasting itches. Interested in this product, he buys the itching powder and compares it to his usual product. One test subject (A) is sprinkled with the original itching powder, and another test subject (B) was sprinkled with the Experimental itching powder. Subject A reported having itches for 30 minutes. Subject B reported to have itches for 45 minutes. Identify the 16. Control Group 17. Independent Variable 18. Dependent Variable 19. Explain whether the data supports the advertisements claims about its product.

SIMPSONS WORKSHEET Lisa is working on a science project. Her task is to answer the question: "Does Rogooti (which is a commercial hair product) affect the speed of hair growth". Her family is willing to volunteer for the experiment. 20. Describe how Lisa would perform this experiment. Identify the control group, and the independent and dependent variables in your description

WATCH THE FOLLOWING VIDEO Initial Observation: Hypothesis: Control: Independent Dependent Variable:

WHAT IS THE DIFFERENCE BETWEEN QUALITATIVE AND QUANTITATIVE DATA? GIVE EXAMPLES Qualitative: Geese migration patterns, Eating habits of squirrels, The way cold weather makes us feel Quantitative: Number of plants growing, height of students, number of baby mice being born

STIMULI VS RESPONSE When you are tired, you yawn Your dog jumps on you when you get home because he is happy to see you Two dogs get into a growling match over a bone You scream when something or someone jumps out at you in a haunted house

OUT OF 500 STUDENTS SURVEYED IN 10, 11, 12 True or False? The amount of driver’s license of 11 th grader’s is. The double the amount of 12 th ofgraders 10 th graders? is is double th amount of 10 The amount of 11 th graders? is 50% more graders than the amount of 10 th graders?

ANALYZE THIS GRAPH OF 2 PLANTS ONE IN REGULAR SOIL, ONE WITH FERTILIZER Plant with Fertilizer Height What is the height of the plant with fertilizer on day 4? Plant w/o Fertilizer What is the total growth of the plant with fertilizer? What is the total growth of the plant w/o fertilizer? DAYS What is their percentage difference?

GRAPH THE FOLLOWING DATA Day New plant sprouts in regular soil with growth hormone in soil 1 2 4 2 3 9 3 5 14 4 7 19 5 8 24 6 9 29 7 11 35 What is the control group? Independent variable? Dependent variable? Conclusion?

CHARACTERISTICS OF LIFE Display organization O ne or more cells Grows and develops Stimulus (responds to) Homeostasis Energy Adapts and evolves over time Reproduces

HOMEWORK Study and Prepare for Test tomorrow!! Know: Vocab Characteristics of Life Graphing and analyzing data Qualitative vs Quantitative Scientific Method