During a six week study, one tank of fish is fed once a day, one tank of fish is fed twice a day, and another tank is fed four times a day. The fish’s weights are recorded daily. © 2015 Tammy Morehouse Name two variables that would need to be controlled in each fish tank. Three different hives of bees were allowed to exit their hive and collect pollen at different times of day. At the end of a month, the amount of honey produced is measured. What is the dependent variable in this investigation? © 2015 Tammy Morehouse One sunflower pot is watered with pure water and 3 others are watered with increasing concentrations of salt water. The height of the sunflowers is measured weekly. What is the independent variable in this investigation? © 2015 Tammy Morehouse Different groups of 7th graders were timed on a math test. One group was allowed to use calculators and one was not. What was most likely being tested in this investigation? a. b. c. d. Battery life of the calculators If students knew how to use calculators If students with calculators could solve problems faster If 7th grade students were smart enough to solve the math problems © 2015 Tammy Morehouse Sherry believes that if cats are fed organic pet food, they would be happier. Is Sherry’s hypothesis testable? Why or why not? © 2015 Tammy Morehouse Two students wanted to find out which of their toy race cars would go the farthest. They let each car roll down a ramp and then measured how far the cars rolled. The The The The height of the ramp weight of the ramp length of the cars shape of the cars Which of these should be held constant if they want a fair test of their cars? a. b. c. d. © 2015 Tammy Morehouse A student is attempting to identify an unknown liquid. She places 10 mL of the liquid in a test tube and begins heating it over a burner. She checks and records the temperature every minute until it begins to boil. What is the independent variable? © 2015 Tammy Morehouse Students in a biology class thought that salt water would affect the movements of planaria. They put 25 planaria in salt water and recorded their observations. Which flaw was present in the design of their experiment? © 2015 Tammy Morehouse Students who like jelly beans 145 Students who do not like jelly beans Rhonda believes that most students like jelly beans. She takes a poll of the 8th grade class and records her results. Based on her data, she believes that her hypothesis is correct. Is her conclusion valid? Use numbers to support your answer. 157 © 2015 Tammy Morehouse 1st 11 2nd 10 3rd 7 4th 5 5th 1 6th A bird feeder was placed in the school yard. Students from each science class recorded the number of birds who visited the feeder. The next day the teacher shared the results with the class. What conclusion can be made from the data? 15 © 2015 Tammy Morehouse Johnathan plants seeds at varying depths. He measures the growth of the plants over the next few weeks and records his data. What is the independent variable in this investigation? © 2015 Tammy Morehouse A student wants to know whether giving dogs toys makes their tail wag more. He gives one group of dogs toys and one group of dogs he does not give toys. He counts how many times each group of dogs tails wag in a given amount of time. What is the control group of this investigation? © 2015 Tammy Morehouse A student believes that ducks swim faster when they are in cold water. He tests two groups of ducks, one in cold water and one in warm water. What will the student be measuring (dependent variable) in this experiment? © 2015 Tammy Morehouse A student wants to know if the amount of water grass receives affects its growth. Is this a testable question? Why or why not? © 2015 Tammy Morehouse © 2015 Tammy Morehouse Mrs. Williams believes that if she gives students peppermints during the test that they will perform better. During the next test she gives half the class peppermints and half the class she does not. What is the independent variable in her experiment? Amanda wants to know what the best time of day is to catch fish. She goes to Hedgehog Pond in the morning and fishes for 4 hours. She then goes to Three Creek Pond in the afternoon and fishes for 4 hours. Has Amanda conducted a fair experiment? Why or why not? © 2015 Tammy Morehouse Hayden was investigating how much water different brands of water balloons could hold. He filled up one balloon from each brand and measured how much water it held until it broke. What could he have done in his investigation to improve his results? © 2015 Tammy Morehouse A recent study found that there is a direct relationship between the amount of exercise students engage in and their academic performance. What was the dependent variable in this study? © 2015 Tammy Morehouse Lorna wants to know if the size of the cookie influences how long it takes to bake. She places differing amounts of cookie dough on baking sheets and times how long it takes for the cookies to bake. What is the independent variable in her investigation? © 2015 Tammy Morehouse A medical company has developed a new anti-itch cream. In order to test how well it works, they give one group of rash sufferers the cream with the medicine and another group of rash sufferers a cream without the medicine. What is the control group of this study? © 2015 Tammy Morehouse Alice wrote down four ideas about earthworm behavior that she wanted to test. Which idea can be tested experimentally? a. b. c. d. Earthworms like the taste of dirt better than sand. Earthworms are happier in black dirt than red dirt. Earthworms exist to decompose decaying materials. Earthworms will move away from direct light sources. © 2015 Tammy Morehouse Sara wants to investigate which type of citrus juice works best at keeping apples from turning brown. She uses lemon juice, lime juice, and orange juice. She places one type of juice on different apple slices and times how long it takes for the apples to brown. What is the independent variable in her experiment? © 2015 Tammy Morehouse Michael believes that the shape of paper airplanes affects how far they will travel. Name two variables that he will need to keep constant in order to test his hypothesis. © 2015 Tammy Morehouse Billy believes that the type of music students listen to affect their heart rate. He separates students into groups and have them listen to rock, country, hip-hop, and pop music. He records each students heart rate before, during, and after they listen to the music. What is the dependent variable in his investigation? © 2015 Tammy Morehouse