Remember the Scientific Method
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1 Experimental Design
2 Remember the Scientific Method Problem/Question Observation/Research Formulate a Hypothesis Experiment Collect and Analyze Results Conclusion Communicate the Results
3 State the Problem/Question You Observed 1. Qualitative Uses the 5 senses, opinion Describes qualities 2. Quantitative Using equipment, standard units Uses numbers
4 Research to Form a Hypothesis Hypothesis an educated guess or prediction stated in If..then. form that is TESTABLE. Forming a valid hypothesis requires background research Scientific Journals: for current research findings Encyclopedias: for scientific info generally accepted State and Local research facilities
5 Predicting To test hypothesis it is necessary to make predictions that logically follows from the hypothesis A statement made in advance that states the results that will be obtained from testing the hypothesis Deductive reasoning = Often in the form of an ifthen statement; reasoning goes from general information to a specific hypothesis Inductive reasoning = reasoning from a particular set of facts to form a general rule; specific to general
6 The Experiment Is a structured procedure to test hypothesis. All good experiments include the following five elements: 1. Independent Variable 2. Dependent Variable 3. Constants 4. Control 5. Repeated Trials
7 The 5 Elements of an Experiment Independent Variable (IV) - the factor that is purposely changed by the experimenter (there is only one IV per experiment) - The thing that I change or manipulate - There is only 1 IV per experiment
8 The 5 Elements of an Experiment Dependent Variable (DV) - the factor that is expected to change and will be measured. The measurement may result in data that is quantitative or qualitative. The thing that is measured or observed, the measurement that depends on what we change.
9 The 5 Elements of an Experiment Constants - the factors that are kept the same among ALL test groups including the experimental groups and control groups. Control Group the group used as a standard for comparison; it receives no treatment (IV). Used as a baseline measurement to compare.
10 The 5 Elements of an Experiment Repeated Trials redoing the experiment to rule out error. Used as a check to see if the experiment is sound. OR
11 Constructing Graphs Title the Graph The effect of (IV) on (DV) Label the Axes with Units! (IV) on the x-axis (DV) on the y-axis Determine the scale for axes Consistent intervals, starting at zero
12 Graph Title (DV) Dependent Variable Don t forget Units!!!!!! (IV) Independent Variable
13 Conclusions & Discussion of Results In all formal experiments, scientists summarize their findings and analyze their data. They discuss problems during experiment. They offer suggestions for improvements for future experiments.
14 Scientific Method a series of steps used to solve a problem
15 Scientific Method Notes People In Hawaii Eat Old Coconuts 1. Problem = what you are trying to solve 2. Information = research or past experiences 3. Hypothesis = an educated guess based on information that is testable
16 4. EXPERIMENT = test your hypothesis a) Controlled experiment = has at least two identical setups Control group = group used for comparing results Experimental group = group in which you change one variable b) Variable = the factor that you change <only one at a time> independent variable = the part that you as the experimenter setup to test or change in the experiment * manipulative variable * goes on the x-axis dependent variable = the observations/measurements that you write down when you do the experiment * the results of the experiment * data, measurements, responses * goes on the y-axis How to graph the variables:
17 c) constants = factors that remain the same and have fixed values d) control = what you compare your experimental results to e) repeated trails = repeat experiments at least 3 times 5. Observations/Record Data = write down what occurs during the experiment, measurements, graphs, charts Qualitative data = observations using your senses Quantitative data = number measurements 6. Conclusion = whether your data supports your hypothesis Hypothesis: Theory: Scientific law:
18 If a question is not testable using the scientific method. Then it is not Science!!!!!
19 Sample Experiment An ecologist with the Environmental Protection Agency (EPA) wants to investigate the effects of acid rain on the reproductive rate of salamanders. The scientist incubates 1000 salamander eggs in mildly acidic water (ph = 6) and another 1000 salamander eggs in neutral water (ph = 7). The water temperature, amount of dissolved oxygen, and light was kept the same among all groups. All eggs were given 63.days to develop.
20 Independent Variable: the ph of the water Dependent Variable: the development of salamander eggs Constants: water temperature, dissolved oxygen, light, and time Control Group: 1000 eggs in neutral water Trials: 1000 eggs in mildly acidic water
21
22 Experimenting Testing a hypothesis or prediction by gathering data under controlled conditions conducting a controlled experiment Based on a comparison of a control group with an experimental group
23 Both groups are identical except for one factor (independent variable or manipulative variable) Observations and measurements are taken for a particular factor (dependent variable) in both groups
24 Collecting Data Includes any and all information that scientist gather in trying to answer their questions Includes all measurements & observations made during the experiment Qualitative data = observe with senses Quantitative = number measurements
25 Measuring Involves quantitative data that can be measured in numbers Sampling Technique of using a sample a small part to represent the entire population Subjective = opinion Objective = actual measurements/facts
26 Organizing Data Involves placing observations and measurement (data) in order Graphs, charts, tables, or maps
27
28 Analyzing Data Collected and organized data must be analyzed Process of determining whether data are reliable or whether they support or do not support a hypothesis or prediction
29 Inferring Conclusions made on the basis of facts or premises rather than on direct observations Often drawn from data gathered from a study or experiment and previous knowledge Not directly testable
30 Forming a Theory A theory may be formed after many related hypotheses have been tested and supported with experimental evidence A broad and comprehensive statement of what is thought to be true Supported by considerable evidence Ties together related hypotheses If never proven wrong over time, a theory can become a scientific law
31 Communication Share the results of their studies with other scientists Publish findings in journals or at scientific meetings Sharing of information is essential to scientific process Subject to examination and verification by other scientists Allows scientists to build on the work of others
AIE: 85-86, 193, 217-218, 294, 339-340, 341-343, 412, 437-439, 531-533, 682, 686-687 SE: : 339, 434, 437-438, 48-454, 455-458, 680, 686
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