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# Statistics for The Behavioral

Statistics

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## Quiz 2 : The Mean, Variance, Standard Deviation, and Z Scores

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?
Free
Multiple Choice

C

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

B

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

C

What is the median of the following scores: 4, 4, 6, 7, 8, 8, 9, 10, 11, 2, 1, 4?
Multiple Choice
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?
Multiple Choice
Five people's scores on a survey of product recognition are 17, 12, 20, 13, 8. What is their mean score?
Multiple Choice
What is the mode of the following scores: 3, 4, 6, 7, 10, 10, 30, 10, 30, 4, 3, 8 ?
Multiple Choice
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
Multiple Choice
Based on the scores 1, 9, 3, 6, 1, 2, 6, 2, 2, 8, a score of 4 is the __________.
Multiple Choice
When a distribution is skewed to the right:
Multiple Choice
The capital Greek letter "sigma" is the symbol for:
Multiple Choice
In a perfectly symmetrical unimodal distribution:
Multiple Choice
The most common single number in a group of scores is the:
Multiple Choice
The rule for calculating the mean is to add up all the scores in a sample and divide by the __________.
Multiple Choice
Based on the following scores 1, 2, 3, 4, 5, 6, 8, 8, 8, 9, 10, a score of 8 is the:
Multiple Choice
In statistical formulas, what does N stand for?
Multiple Choice