2InstructionsI will NOT take a grade on this. This is to help you practice and to be ready for the test!Please work each problem and answer the questions first.The answers are at the end of the presentation. When you have answered all of the questions, go to the back and check your answers.If you are confused…SEE ME to get extra tutoring before the test. I am available during recess and lunch. I will also be available Wednesday and Thursday after school, if you let me know you’re coming.
5What is the independent variable? What is the dependent variable? QUESTION 3What is the independent variable?What is the dependent variable?What variables should be controlled?What is the BEST type of graph to use?
7What is the independent variable? What is the dependent variable? QUESTION 5What is the independent variable?What is the dependent variable?What variables should be controlled?What is the BEST type of graph to use?GRAPH the results.
9Identify the independent variable. Identify the dependent variable. QUESTION 7Identify the independent variable.Identify the dependent variable.What variables need to be controlled?If you want to make an estimate of plant growth with 7 hours of light, what is the BEST type of graph to make?GRAPH your results using that type of graph.
12Identify the independent variable. Identify the dependent variable. QUESTION 10Identify the independent variable.Identify the dependent variable.What variables should be controlled?
13QUESTION 11A student wants to test which soil holds the most water. He uses 4 different types of soil. He puts a different amount of water in each can, and pokes different sized holes at the bottom. He measures how much water drains out of each can after 10 minutes.What 2 mistakes did the student make with his variables? How can he fix this experiment?
14What is YOUR hypothesis? What is the independent variable? QUESTION 12A student wants to test how far a car wheel roll, if it is rolled from different heights on a ramp. Help the student design an experiment!What is YOUR hypothesis?What is the independent variable?What is the dependent variable?What variables should be controlled?Write the procedure for doing the experiment.
15Answers 1-5: J – Which materials conduct electricity? F – plant height Independent – type of soilDependent – plant growth/heightConstants – type of plants, amount of water, soil, sunlight, same temperatureUse a BAR graph (comparing categories; only 1 set of numbers)B – Brand M lasted longer than the other brands testedIndependent – Brand of battryDependent – Hours of battery lifeControls – same flashlight, all batteries should be newUse a BAR graph (comparing categories, only 1 set of numbers)
16Answers 6-10:6. C – The plants that received 8 hours of sunlight grew the most7. independent: amount of lightDependent: Average growthControls: same plants, same amount of water, soil, same temperature, same type of soil, etc.Use a LINE graph (2 sets of numbers, use line graphs for estimates)8. B – water with more salt takes longer to freeze9. B – will ants go to a light area or a dark area?10. Independent: amount of lightDependent: number of ants that go to each placeControls: same size of light/dark areas; same ants; same conditions in each area
17Answers 11-12:11. Mistake 1: Using different amounts of water.Mistake 2: Poking different sized holes in each canFix these mistakes so that all variables are controlled. The amount of water and the size of the holes should be the same.12. Hypothesis: I think that if the car is lifted higher up the ramp, it will roll a longer distance, because it has more momentum.Independent variable: Height rolled from the rampDependent variable: Distance traveledControls: Same car, same ramp angle, same amount of time to rollProcedure: Roll the car from point K and measure the distance in centimeters that it rolls in 10 seconds. Repeat from points L, M, and N, measuring the distance that each rolls in 10 seconds.