An education researcher collects data on how many students are on scholarship at various local colle

Intuitive statistical method

The two main branches of statistical methods are descriptive statistics and inferential statistics.

Question 1 of 25
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An education researcher collects data on how many students are on scholarship at various local colleges. The researcher then makes a frequency table to summarize the data. The researcher is using a(n):


   A.measure of central tendency 
Correct   B.descriptive statistical method 
   C.intuitive statistical method 
   D.inferential statistical method 

 Answer Key: B
 
 
Question 2 of 25
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The two main branches of statistical methods are:

   A.theoretical and inferential 
   B.intuitive and observational 
   C.descriptive and intuitive 
Correct   D.descriptive and inferential 

 Answer Key: D
 
 Question 3 of 25
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Several employees of a major corporation are rated for their degree of job satisfaction. If a particular employee’s job satisfaction is rated 8 on a 20-point scale, 8 represents that employee’s:

   A.frequency 
   B.variable 
Correct   C.score 
   D.percentile 


 Answer Key: C
 
 
Question 4 of 25
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An intelligence test includes 15 items. Thus, a person could get any number correct between 0 and 15. Each of these numbers correct (0–15) that a person could possibly get is called a:

Correct   A.value 
   B.variable 
   C.frequency 
   D.mean 

 Answer Key: A
 
 
Question 5 of 25
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All of the following are examples of rank-order variables EXCEPT:

   A.a student’s rank in his or her graduating class 
   B.a tennis player’s standing compared to other athletes in the region 
   C.a runner’s place finished in a race 
Correct   D.a student’s level of stress just before an exam 

 Answer Key: D
 
Question 6 of 25
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Which of the following is an example of a nominal variable?

   A.Grade point average (3.2, 2.7, etc.) 
   B.Number of friends a person has (0, 1, etc.) 
   C.Birth position in a family (first, second, etc.) 
Correct   D.Nationality of the car a person owns (American, Japanese, etc.) 


 Answer Key: D
 

Question 7 of 25
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The word “frequency” in a frequency table refers to:

   A.cycles per second 
Correct   B.the number of scores at each value of a variable 
   C.the times per unit change of each score 
   D.the cumulative percentage for any given value 

 Answer Key: B
 
 
Question 8 of 25
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In a histogram, the vertical (up and down) dimension displays:

   A.possible values the variable can have 
   B.intensity of the variable 
   C.mean score 
Correct   D.frequency 

Answer Key: D
 
 
Question 9 of 25
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When making a histogram, it is easiest if you begin with a:

   A.list of all the scores in order 
Correct   B.frequency table 
   C.list all of the percentages in order 
   D.normal curve table 


 Answer Key: B
 
 
Question 10 of 25
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Social scientists use frequency tables, histograms, or frequency polygons to show:


   A.the relation between two variables 
   B.the reasoning behind experiments 
   C.specific hypotheses and test their validity 
Correct   D.how the data they collect are distributed 

 Answer Key: D
 
 
Question 11 of 25
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The distribution of scores in a research study in the behavioral and social sciences is usually:


Correct   A.unimodal 
   B.bimodal 
   C.multimodal 
   D.rectangular 

 Answer Key: A
 

Question 12 of 25
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On the first exam in an introductory statistics class most students did very well and only a few did poorly. How would you describe the distribution of test scores?


   A.Symmetrical 
Correct   B.Skewed to the left 
   C.Having a floor effect 
   D.Skewed to the right 


 Answer Key: B
 

Question 13 of 25
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A researcher observes the level of aggression of six 5-year-old boys over the course of a school day. The number of incidents for the group of boys was 2, 4, 6, 12, 8, 10. What is the mean number of aggressive acts for this group of children?


   A.4 
   B.5 
Correct   C.7 
   D.9 

 Answer Key: C
 
 
Question 14 of 25
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What is the mode of the following scores: 3, 4, 6, 7, 10, 10, 30, 10, 30, 4, 3, 8 ?


   A.3 
   B.4 
   C.8.5 
Correct   D.10 

 Answer Key: D
 
 

Question 15 of 25
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What is the median of the following group of scores: 1, 2, 2, 3, 4, 4, 4, 6, 8, 10?

   A.3 
   B.5.5 
Correct   C.4 
   D.3.5 

 Answer Key: C
 
Question 16 of 25
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Which statement is true for the scores 1, 2, 3, 4, 5, 5, 7, 8, 9, 10, 12, 12, 12?

  Correct  A.The mode is greater than the median 
   B.The median is greater than the mean 
  C.The median is greater than the mode 
   D.The mode is greater than the mean 

 Answer Key: A
 
 
Question 17 of 25
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The ________ is the usual way of describing the representative value for a nominal variable such as religious affiliation.

   A.mean 
   B.outlier 
   C.median 
Correct   D.mode 


 Answer Key: D
 

Question 18 of 25
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Unless there are __________ , behavioral and social scientists generally use the mean as the measure of the representative value of a group of scores.

Correct   A.outliers 
   B.histograms 
   C.Z scores 
   D.two modes 

 Answer Key: A
 
 
Question 19 of 25
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In order to compute the range of a group of scores, one must:

Correct   A.subtract the lowest score from the highest score 
   B.multiply the lowest score by the average 
   C.multiply the highest score by the average 
   D.subtract the lowest score from the highest and divide by N 


 Answer Key: A
 
 
Question 20 of 25
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The variance of a group of scores is the same as the:

Correct   A.average of the squared deviations from the mean 
   B.sum of the squared deviations about the mean 
   C.average of the absolute deviations from the mean 
   D.sum of the absolute deviations from the median 


Answer Key: A
 
 
Question 21 of 25
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The variance of a group of scores is 9. What is the standard deviation?

   A.1 
Correct   B.3 
   C.4.5 
   D.81 


 Answer Key: B
 
 
Question 22 of 25
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A researcher surveys job satisfaction among laborers and white-collar workers. (Job satisfaction is rated on a scale from 1 = low satisfaction to 10 = high satisfaction.) Results show that laborers have a mean job satisfaction score of 3 and a variance of 1; white-collar workers have a mean job satisfaction rating of 7 and a variance of 10. Which statement best describes what these numbers mean?


   A.White-collar workers are less satisfied than laborers. 
   B.White-collar workers and laborers are about equally satisfied. 
   C.Laborers generally are less satisfied than white-collar workers, but laborers are just as likely to be highly satisfied as white-collar workers are to be highly dissatisfied. 
Correct   D.Laborers are less satisfied than white-collar workers and most laborers are about equally dissatisfied while there is more variation in the satisfaction of white-collar workers. 

 Answer Key: D
 
 
Question 23 of 25
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Donald’s score on the statistics test was +1.25. This means that he scored:

   A.slightly below the average 
   B.just at the average 
   C.a little less than one standard deviation below the mean 
Correct   D.more than one standard deviation above the mean 


Answer Key: D
 
 
Question 24 of 25
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A person’s raw score is 7, the mean is 13, and the standard deviation is 3. What is the person’s Z score?

Correct   A.2 
   B.1 
   C.1 
   D.2 

 Answer Key: A
 
 

Question 25 of 25
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A research article states that “At the time of the study, the mean age of first-year college students at Wayne University was 17.6 (3.57). The number in parentheses likely represents:


   A.the Z score 
Correct   B.the standard deviation 
   C.the mode 
   D.an outlier 


 Answer Key: B