Review of Experimental design

What you need to know: 1) What are the steps in experimental and what happens at each step.2) How to set up a graph and how to interpret a graph.3) What a controlled experiment is and all the parts it contains including independent variable, dependent variable, controls experimental group, and control group.4) What a hypothesis is, how to write one, how it can be tested in addition to what a quality hypothesis looks. Match the vocabulary words to the correct definitions. Hypothesis A testable prediction Control Group that receives the "normal" conditions Independent/ Manipulated Variable The variable that the scientist changes Dependent Variable The variable that is measured Constant A condition during the experiment that stays the same for all groups being tested Observation Using your five senses to determine information Inference Drawing a conclusion using the evidence at hand Which of the following puts the steps of a scientific experiment in the correct order? 2,3,1,4 2,1,4,3 2,1,3,4 4,2,3,1 What is the purpose of an experiment? To communicate data To test a hypothesis To prove a scientific law None of these Global Warming Experiment Iker is concerned about global warming. He believes that much of the problem is caused by the intense heat arising from surfaces such as streets and the roofs of buildings. Iker convinces the principal of his school to run an experiment. With the help of other students, Iker raises money for a rooftop garden to be put in on one half of his school building. For one semester, Iker keeps track of the air temperature on the half of the building with the rooftop garden and the half of the building without the garden. He finds that the average temperature near the rooftop garden is 73°F. The average temperature away from the garden is 84°F. What is the manipulated variable for the Global Warming Experiment? Air Temperature Location Global Warming Time of Day What is the dependent variable for the Global Warming Experiment? Air Temperature Location Global Warming Time of Day What is a constant in order for the Global Warming Experiment to be valid? Air Temperature Location Global Warming Time of Day According to the data shown in the graph, the hypothesis is only correct for latitudes- up to 40 degrees from the equator from the poles to 40 degrees from the equator between 20 degrees and 60 degrees from the equator farthest from the equator There is a greater average humidity in the north south In the late 1920s, Edwin Hubble and Milton Humason determined the distance to a number of galaxies and the velocity of those galaxies relative to the Earth. The graph shows the early results that were obtained. What approximate ratio did the scientists calculate between velocity and distance based on these early findings? 300 kilometers per second per one million light years 600 kilometers per second per one million light years 450 kilometers per second per one million light years 150 kilometers per second per one million light years If we observe that these galaxy have red shift, what conclusion can be made based on the data in the graph? Galaxies closer to Earth are moving closer faster. Galaxies closer to Earth are moving away faster. Galaxies farther away from Earth are moving away faster. Galaxies farther away from Earth are moving closer faster. What is the independent variable for this graph? Velocity Distance Galaxy None of These How much limestone was worn away between Day 1 and Day 2? 2.5 grams 2.8 grams 0.2 gram 2.3 grams According to this graph, which rock or mineral erodes the fastest? Sandstone Limestone Granite Quartz Put the steps of the scientific method in the correct order in the column on the left. Match the example with each of the steps in the right column Steps of the Scientific Method Observation Hypothesis Experiment Data Conclusion Example Mrs. Sandberg noticed that a lake was completely green from algae blooms (excessive growth). Mrs. Sandberg thinks the algae are thriving off nitrogen fertilizer running off from nearby farms. Mrs. Sandberg uses unique plants to absorb extra nitrogen to see if it prevents the nitrogen runoff. She counts the algae growth in the lake and finds that the algae growth has declined. Her research shows that the unique plants likely absorbed the algae and can prevent blooms. Turtles lay eggs in holes that they dig in the ground. The temperature that eggs are incubated at determines whether the offspring are male or female. Warmer temperatures lead to more females. The normal soil temperature is 35C.Use the data table to identify the constant, control group, experimental group, IV, and DV. Based on the experiment above put the items into the correct category. Constants pH of water Sand color Wind Speed Control Group Eggs incubated at 35 C Experimental Group Eggs incubated at 25, 30, 40, and 45 C Independent variable Temperature eggs are incubated at Dependent variable Number of females hatched I notice that when I walk into the room, my parrot squawks. I think that he might squawk because he recognizes me. I test this by walking into the room and having my mom, brother, and father walk in the room at different times and record the number of squawks. We all wore the same color clothing, took the same number of steps into the room, spent the same amount of time in the room, and did not wear any perfumes. I found that my parrot only squawks when my mom and I walk into the room. These data suggest that my parrot squawks when he sees females. The control group is me.The experimental group is the rest of my family.The IV is the person walking into the roomand will be graphed on the x-axis.The DV is the number of squawksand will be graphed on the y-axis.The constants are the color of clothing, the number of steps into the room, the time spent in the room, and the lack of perfume. A controlled experiment contains....