RESEARCH METHODS-W/ACCESS >CUSTOM<
RESEARCH METHODS-W/ACCESS >CUSTOM<
5th Edition
ISBN: 9781305743625
Author: GRAVETTER
Publisher: CENGAGE C
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Chapter 3, Problem 3EA

For each of the following operational definitions, decide whether you consider it to be a valid measure. Explain why or why not. Decide whether you consider it to be a reliable measure. Explain why or why not.

  1. A researcher defines academic motivation in terms of the number of minutes a student spends working on class-related material outside of class during a 24-hour period from noon on Monday to noon on Tuesday.

  • A professor classifies students as either introverted or extroverted based on the level of participation in class discussions during the first week of class.
  • A sports psychologist measures physical fitness by measuring how far each person can throw a baseball.
  • Reasoning that bigger brains require bigger heads, a researcher measures intelligence by measuring the circumference of each person’s head (just above the ears).
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    For unemployed persons in the United States, the average number of months of unemployment at the end of December 2009 was approximately seven months (Bureau of Labor Statistics, January 2010). Suppose the following data are for a particular region in upstate New York. The values in the first column show the number of months unemployed and the values in the second column show the corresponding number of unemployed persons. Months Unemployed Number Unemployed 1 1029 2 1686 3 2269 4 2675 5 3487 6 4652 7 4145 8 3587 9 2325 10 1120 Let x be a random variable indicating the number of months a person is unemployed. a. Use the data to develop an empirical discrete probability distribution for x (to 4 decimals). (x) f(x) 1 2 3 4 5 6 7 8 9 10 b. Show that your probability distribution satisfies the conditions for a valid discrete probability distribution. The input in the box below will not be graded, but may be reviewed and considered by your instructor. c. What is the probability that a person…

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