Free Sample: Time of Death Experimental Design paper example for writing essay

Time of Death Experimental Design - Essay Example

Identify the independent and dependent variables. The independent variable is the variable that is varied or manipulated by the researcher. The dependent variable Is the measurable effect, outcome, or response in which the researcher is interested. In other words, the independent variable is the presumed cause, whereas the dependent variable is the presumed effect. In an experiment, the independent variable is the variable that is controlled and manipulated by the experimenter; the dependent variable Is not manipulated but Instead Is observed or measured for variations. Rite a one or two sentence tenement predicting the outcome of the experiment. In a separate statement, specify the independent and dependent variables. Hypothesis: The independent variable is: The dependent variable is: 3. Design the experiment to be used to test your hypothesis. Include a list of all materials used. Be specific. Take all safety concerns Into account. Identify a control to be used for comparison if applicable. Define how the data will be collected and recorded, including measurement units. Design a data table to use to record information. Plan the strategy that will be used to summarize the data.

For example, a graph eight be used to summarize the data. Write a series of numbered steps and include a list of required materials. The data table should include units that will be used to collect data. Materials: 3 Computers with Logger Pro software 3 Fernier Temperature Probes Goggles Gloves Laboratory apron Oven mitt 3 Ring stands with clamp 3 Test tubes Sodium polycarbonate (also known as waterfowl) Weigh boats Electronic balance Thermometer 37 c water Graduated cylinder Hot water bath set to approximately ICC Ice water bath Room temperature water Procedure: 1 . Wear the appropriate personal protective equipment. Create the following three water baths: A 250 ml beaker filled with 200 ml of water on a hot plate set to medium heat that is approximately ICC. A 250 ml beaker filled with 200 ml of water at room temperature (approximately ICC). A 250 ml beaker filled with 200 ml ice water 3. Obtain three test tubes and measure and place 1 gram of sodium polycarbonate into each. 4. Obtain three Fernier Temperature Probes, three analog thermometers, and three ring stands with clamps. 5. Start Logger [email protected] software on the computers. 6. Click on File Open and open the Forensics with Fernier folder. 7. Open the aerogram titled 14 Hot Air, Cold Body. . Connect the Labiates Mini to each computer using USB cables. 9. Connect the Temperature Probes into CHI 1 of the Labiates Minis using the British Telecoms connector. 10. Place the thermometer in the water baths to ensure that they maintain the correct temperatures. Record this temperature in the Evidence Record table. 1 1 . Attach the Temperature Probes to the clamp on the ring stands. 12. Place 20 ml of 37 water into the test tubes. These represent dead bodies. 13. Place a test tube with waterfowl representing the dead body in each of the three water baths. 14. Place a imperative sensors to reach the temperature of the waterfowl.

Click to begin data collection. Note that the experiment is set to collect data for 20 minutes. 16. Make sure to maintain a constant temperature for your water baths throughout data collection. 17. When data collection is complete (data has been collected for 20 minutes), click the Statistics button, , to display a Statistics box. 18. Record the minimum temperature recorded and the maximum temperature recorded in the appropriate spot in the Evidence Record table for each water bath. 19. Record the temperature change and record in the Evidence Record table for each water bath.

Note: The temperature change is displayed in the Statistics box as Ay. ) 20. Copy the graphs by placing the mouse cursor over the graph, left clicking, and then pressing both the Control and the C keys simultaneously. Paste the graphs into a Word document and save. To paste the graph, press both the Control and the V keys simultaneously. Repeat this step in order to copy and paste the Data Table into the Word document. Attach the graphs in the Results section below. 21 . Repeat the experiment for a total of three trials. 1 . Carry out the experiment. Collect data. Make observations.

Complete multiple trials. Perform the procedure many times, collecting data each time. ) Complete the data table. Include units and labels for each section. Evidence Record Assigned Temperature: Actual Temperature of Water Bath Maximum Temperature of Waterfowl Minimum Temperature of Waterfowl Temperature Change Soc Room temperature 22. Analyze the data and observations. Make graphs or charts of the data. Check that the independent and dependent variables are properly placed on any graphs. Be logical and clear. Look beyond the obvious. Make graphs and charts to visually and logically present the data.

Write in paragraph arm and include calculations showing all work. All analysis should be explained clearly and concisely. Graph: Temp: Group 1 Temp Change Group 2 Temp Change Group 3 Temp Change Group 4 Temp Change Group 5 Temp Change Average Temp Change Use a one sentence statement. Be clear and concise. Write a one sentence statement directly related to the original hypothesis. It might start with “The hypothesis was correct… ” Conclusion: 24. Summary Paragraph Write a brief paragraph. Explain the rationale for your conclusion. Clarify details. Write one paragraph of text explaining the rationale for the conclusion. Summary Paragraph: