Lab_ Measurements

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University of Michigan *

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216

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Psychology

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Apr 3, 2024

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pdf

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2

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Part I: History of Measurements -- To watch before Quiz 1 Watched all the videos Part II: Measurements & Conversions 1. How many meters are in a mile? 1609.34 meters in 1 mile 2. A man is 5’10” ft. tall. What is his height in meters? 5 feet is 1.524 meters + 10 inches is 0.254 = 1778 meters 3. Convert 120 pounds to kilograms. 54.4311 kilograms is 120 pounds 4. How many seconds are in an hour? 3600 seconds in an hour 5. Convert room temperature, 70° Fahrenheit to Celsius. 21.11 degrees celsius 6. Express 65 miles/ hour in meters/second. 29.0576 meters/second Part III: Theoretical Values, Experimental Values, and Percent Error Questions 1. The value of a quantity is generally expressed as the product of a number and a unit. 2. Use the methods we’ve learned in today’s lab to find the percent difference of your team’s average reaction time. Show your calculations here:
| 𝑡ℎ??𝑟?𝑡𝑖𝑐𝑎? − ?𝑥??𝑟𝑖???𝑡𝑎? 𝑡ℎ??𝑟?𝑡𝑖𝑐𝑎? | 𝑥 100 = 𝑃?𝑟𝑐??𝑡 𝐷𝑖???𝑟??𝑐? 3. Based on this test, was your team’s reaction time faster, slower, or the same as the average reaction time? I was not able to complete the test with my team because I was absent for the class. 4. What are the two greatest contributors to measurement uncertainty in this test? For each one, can you suggest a method to reduce the uncertainty? Personal and random error could be two contributors to measurement uncertainty. Personal error could be a personal bias when reading the measurement tool so maybe read the measurement more than once to reduce the error. Random error could occur if there was a fluctuation in temperature or experiment setup so in order to reduce this make sure there are no outside forces influencing the data collected. 5. Suggest two ways you could determine whether your results are affected by systematic error? You can compare the results from your data collection with the standard result to eliminate bias. Also my doing multiple tests for more accurate results. 6. Humans respond faster to auditory stimuli than visual stimuli. Suggest a test to find your reaction time of an auditory stimulus. A test could be comparing how long it takes people to stop if they are screamed at with the word “stop” or if they are faced with a stop sign.
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