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 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. SpongeBob Clean Pants SpongeBob noticed that his favorite pants were not as clean as they used to be. His friend Sandy told him that he should try using Clean-O detergent, a new laundry soap she found at Sail-Mart. SpongeBob made sure to wash one pair of pants in plain water and another pair in water with Clean-O detergent. After washing both pairs of pants a total of three times, the pants washed in the Clean-O detergent did not appear to be any cleaner than the pants washe din plain water. Independent Variable Type of detergent Dependent Variable how clean the pants are Experimental Group Pants washed with Clean-O Control Group Pants washed in plain water Constant Variable Washing Machine What conclusion should SpongeBob have? Clean-O is a the best detergent Clean-O is a worse detergent than plain water Clean-O has the same effect that plain water has 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 Find the average number of fish attracted with each instrument. Round to the nearest tenth. No Music Average Clarinet Average Flute Average Guitar Average 3.3 12.3 7.3 12.3 What should Squidward's conclusion be? Make sure you write a complete conclusion:Claim- Was Squidward's hypothesis supported or not?Evidence- What data in your table supports your claim?Reasoning- What did Squidward learn?