Scientific Method 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 For each hypothesis determine which is the dependent and which is the independent variable. 1. If you increase the amount of blood in the water, then you will determine the number of sharks in the area.2. If you increase the amount of milk you drink, then you will increase the strength of your bones.3. If you increase the amount of water a plant receives, then it will produce fruit faster.4. If heavier paper is used on a paper airplane then the flight will fly further.5. If wear Nike shoes then you will be able to jump higher. Independent Variable amount of blood in the water amount of milk amount of water weight of paper Nike shoes Dependent Variable number of sharks bone strength time it takes for fruit to be produced flight distance jump height 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