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Statistics for The Behavioral

Statistics

Quiz 2 :

The Mean, Variance, Standard Deviation, and Z Scores

Quiz 2 :

The Mean, Variance, Standard Deviation, and Z Scores

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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?
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Multiple Choice
Answer:

Answer:

C

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The ordinary average of a group of numbers is called the __________.
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Multiple Choice
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Answer:

B

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Which statement is true for the scores 1, 2, 3, 4, 5, 5, 7, 8, 9, 10, 12, 12, 13?
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Multiple Choice
Answer:

Answer:

C

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What is the median of the following scores: 4, 4, 6, 7, 8, 8, 9, 10, 11, 2, 1, 4?
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A Canadian political scientist discovers that the number of members of their provincial parliament that a group of voters can name is as follows: 3, 3, 3, 4, 4, 5, 6, 7, 8, 9, 10, 35. Upon examination of these scores, the researcher would probably decide to use which measure of the typical value?
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Five people's scores on a survey of product recognition are 17, 12, 20, 13, 8. What is their mean score?
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What is the mode of the following scores: 3, 4, 6, 7, 10, 10, 30, 10, 30, 4, 3, 8 ?
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A research team studied the rate at which infants in the three different countries vocalized distress. Below are the scores from each country. Which group of infants showed the highest mean rate of distress vocalization over the 45-minute observation period? Country A: 9, 9, 10, 13, 8, 8, 11, 11, 10, 7, 13, 6, 18, 9, 9, 12, 13, 10, 5, 14 Country B: 15, 15, 16, 19, 14, 14, 17, 17, 16, 13, 19, 12, 18, 10, 10, 15, 15, 2, 2, 5 Country C: 4, 6, 20, 17, 15, 30, 18, 18, 25, 2, 29, 17, 16, 35, 19, 1, 30, 25, 16, 15
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Based on the scores 1, 9, 3, 6, 1, 2, 6, 2, 2, 8, a score of 4 is the __________.
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When a distribution is skewed to the right:
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The capital Greek letter "sigma" is the symbol for:
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In a perfectly symmetrical unimodal distribution:
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The most common single number in a group of scores is the:
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The rule for calculating the mean is to add up all the scores in a sample and divide by the __________.
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Based on the following scores 1, 2, 3, 4, 5, 6, 8, 8, 8, 9, 10, a score of 8 is the:
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In statistical formulas, what does N stand for?
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The median is greater than the mean in a distribution that is:
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The representative value of a group of scores refers to the middle of the group of scores. All of the following are types of representative values EXCEPT:
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The middle value in a set of scores lined up from lowest to highest is the:
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What is the median of the following group of scores: 1, 2, 2, 3, 4, 4, 4, 6, 8, 10?
Multiple Choice
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