8B2 Scientific Investigation

The first step in the scientific method is to _ Gather Data Identify a problem Perform an experiment Design an experiment Fill in the blanks by choosing the correct answer for those listed when you click on the blank. There are two types of observations; qualitative and quantitative. The observations that contain a number are quantitative observations. Observations without a number are qualitative. An inference is a conclusion drawn using prior knowledge and a general understanding of the world around us. Match the terms with their definitions. Independent Variable The variable that is changed in an experiment Dependent Variable The variable we measure in a lab Controllled Variables (constants) Things kept the same in all trials An experiment is conducted to see which type of gum allows for bigger bubbles to be blown. The gum is chewed by the same person, for the same amount of time and the diameter of the bubbles is determined from pictures taken. Type of gum Independent Variable Size of bubbles Dependent Variable Same person, time Controllled Variables (constants) Hawkins loves to garden and wants to grow lots of pink flowers for his pal Karsten. He bought a special Flower Power fertilizer to see if will help plants produce more flowers. He plants two plants of the same size in separate containers with the same amount of potting soil. He places one plant in a sunny window and waters it every day with fertilized water. He places the other plant on a shelf in the kitchen and waters it with plain water every other day. What should Hawkins do to improve his experiment? Answer using complete sentences. My usual rose bushes are not producing many roses in the greenhouse. So, I grew different rose bushes in the greenhouse for two months. The number of roses on each rose bush is counted at the end of the experiment.The usual rose bushes are the controlgroup.The type of rose bush is the independent variable.The number of flowers is the dependent variable.The greenhouse is a controlledvariable kept the same for all of the rosebushes. Ben wants to know if the amount of salt in water affects plant growth. He waters three flowers with different concentrations of salt water. He waters a fourth flower with tap water. He measures their growth throughout his experiment.The amount of salt is the independent variable.The type of flower plant used for all groups is a controlledvariable.The plant growth is the dependent variable.The control group gets tap water. *A study was created to test the effects of fear in children. The hypothesis of the experimenters was that if babies were exposed to fuzzy bunnies and at the same time a loud cymbal was struck close behind them, then that child would be afraid of all fuzzy things. Another group of children would be exposed to bunnies without any loud noises. The study was carried out as planned and as a result, hundreds of young children developed fear of all cute furry bunny rabbits.*Note: Don't try this at home! The fuzzy bunnies are a controlledvariable found in both experiment groups.The fear of bunny rabbits is the dependent variable.The loud noise is the independent variable.The children not exposed to the loud noise are in the control group.