Scientific Method and Variables Practice

For each problem or question, determine which is the independent variable and which is the dependent. 1. How does the amount of time watching T.V. affect the reading scores of fourth graders?2. How does the length affect the distance that a paper airplane flies?3. How does giving detention for missing homework affect the amount of missing homework that gets turned in?4. How does the temperature of water affect how high an ice cube floats?5. How does the type of music affect student heart rates? Independent Variable Amount of time watching TV wing length Giving detention for missing work Water Temperature Type of music Dependent Variable Reading scores of fourth graders paper airplane flight distance Amount of missing work Ice Cube Float Height Student heart rates Krusty Krabs Breath Mints Mr. Krabs created a secret ingredient for a breath mint that he thinks will "cure" the bad breath people get from eating crabby patties at the Krusty Krab. He asked 100 customers with a history of bad breath to try his new breath mint. He had 50 customers (Group A) eat a breath mint after they finished eating a crabby patty. The other 50 customers (Group B) also received a breath mint after they finished the sandwich, however, it was just a regular breath mint and did not have the secret ingredient. Both groups were told that they were getting the breath mint that would cure their bad breath. Two hours after eating, 30 customers in group A and 10 in group B reported having better breath. Independent Variable Secret Ingredient Dependent Variable Number of people with bad breath Experimental Group People who got the secret ingredient Control Group People who did not get the secret ingredient Constant Variables crabby patties What is the best conclusion for Mr. Krabbs to determine? The secret ingredient does help bad breath that customers get from crabby patties. The secret ingredient does not help with the bad breath that customers get from crabby patties. There is no change between the bad breath that customers got. Squidward's Symphony Squidward loves playing his clarinet and believes it attracts more jellyfish than any other instrument he has played. In order to test his hypothesis, Squidward played a song on his clarinet for total of 5 minutes and counted the number of jelly fish he saw in his front yard. He played his song for a total of 3 times on the clarinet then repeated the experiment using a flute and then a guitar. He also recorded the number of jellyfish he observed before he began playing an instrument. The results are shown in the data table. Independent Variable Type of instrument being played Dependent Variable Amount of jellyfish attracted Constant Variable Time each instrument was played