ex2ab09 - 23 Questions, 6 pages name (required) _ Errors in...

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23 Questions, 6 pages name (required) ___________________ Bio301D Exam 2; 14 Oct 2009 1 of 6 Errors in Data 1. (4 pts.) Exam Key Code: Fill in bubbles (AB) on question 1 to indicate your exam code; leave the other bubbles blank. Also, fill in the correct bubbles for your name and EID on the scantron form. EID goes in the ID field. 2. (4 pts) Which of the following demonstrations were used to illustrate errors or fixes in data, and which options also correctly identify the type of error/fix illustrated? MTF A) “choose a random odd number” to illustrate randomization B) width of a coin to illustrate RPA error C) choose your favorite color to illustrate bias D) coin flip to illustrate how to reduce sampling error E) video clip from the movie Spinal Tap to illustrate (bad) standards: “it’s one louder” 3. (4pts) Two samples of opinion from the same student body differ but the difference is not statistically significant. To what type of error do we attribute the difference? One answer only . A) Sampling B) Bias C) RPA E) Protocol F) None 4. (5pts) For which of the following is RPA error present (even if irrelevant)? MTF A) When data are randomized B) For discrete characters (present/absent) C) Measuring something quantitative (length, weight) to 3 decimals when you only need 2 decimals D) When taking two or more quantitative measurements of the same object twice E) When using laser technology to measure a distance 5. (5pts) Lecture noted that some types of errors occurred when acquiring the subjects/objects that are to be measured, whereas other errors occur when making the measurements themselves. Which types of errors were said to occur in the first of these (underlined )? If a type of error was not mentioned, do not use it. MTF A) Sampling error B) Human and technical C) RPA D) the part of bias fixed by randomization E) the part of bias fixed by blind observers 6, 7. In the following two questions, indicate which types of error are indicated. one only per question 6. (4 pts) An employer decides to test his 200 employees for drugs. Using urine, he first checks creatinine levels to look for any diluted samples. He finds that, while nearly all of his employee samples have creatinine levels within the normal range, one employee has a low level, below 1% of that found in the population, and a second test of the same sample shows that the level is indeed low. Based on this evidence, he fires that employee for diluting their sample. What type of error could account for the unusually low creatinine level in one employee? (one only) A) Sampling B) Bias C) RPA D) Human and technical E) None
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Bio301D Exam 2 14 Oct 2009 2 of 6 7. (4 pts) Caucasian researchers in the late 1800s and early 1900s attempted to measure the “intelligence” of different human races by filling empty skulls with lead shot to determine brain volume. They knew the race of each skull at the time
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This note was uploaded on 12/20/2010 for the course BIO 301D taught by Professor Bull during the Spring '08 term at University of Texas at Austin.

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ex2ab09 - 23 Questions, 6 pages name (required) _ Errors in...

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