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Chapter 2
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Gravity
Terms in this set (50)
Who is credited with the development of the
correlation?
Francis Gouton
This is the value that best represents an entire group
of scores.
average
Which of the following is not a measure of central
tendency?
standard deviation
This measure of central tendency can be considered the most precise:
mean
This measure of central tendency can be considered the least precise:
mode
What should be used to determine central tendency?
an average
This consists of the middle point of a set of values:
mean
What is the most common average computed?
mean
What is the symbol used to represent the mean?
X with a bar over it
What is another term for the mean?
arithmetic average
arithmetic mean the point at which the sum of the deviations is equal to zero. page 22
What value is most often used to represent an entire group of scores?
mean
If a distribution is "significantly distorted" what is this called?
skew
What is another way of describing "measures of central tendency"?
averages
14. What is the formula for computing the mean?
X (line above) = greek letter X/n
This is calculated by multiplying values by the frequency of their occurrence, adding the total of all the products, and then dividing by the total number of occurrences:
weighted mean
Which of the following symbols represents the individual score?
X
17. What does the symbol represent?
the sum of values
18. What is the name of the letter ( greek letter or o)
sigma
19. Which of the following symbols represents sample size?
n
What does the symbol M represent?
mean
21. If you know M = 5 and the sum of scores is 20, what is n?
4
If 4,390 and n = 4, what is M?
99.77 ??
23. What is the Mean value for the following scores: 10, 35, 40, 60, 55, 25, 50
39.29
24. What is the Mean value of the following scores: 12, 25, 15, 27, 32, 8?
19.83
25. What is the Mean value of the following scores: 1.11, 1.17, 1.15, 2.02, 2.07, 3.11, 2.14?
1.82
26. What is the Mean value of the following scores:117, 132, 147, 156, 196?
149.6
27. Your current exam mean is 97.2. If you receive a 99 on the next exam, this will have the effect of:
increasing your mean
28. Your current exam mean is 93.2. If you receive a 87 on the next exam, this will have the effect of:
decreasing your mean
29. Your current exam mean is 95. If you receive a 95 on the next exam, this will have the effect of:
...
30. Which measure of central tendency is most influenced by outliers?
mean
31. What does the large N represent?
population size
32. What does the small n represent?
sample size
33. Which measure of central tendency is also known as the midpoint for a set of scores?
median
34. For which of the following is the sum of the deviations from the mean always equal to zero?
arithmetic mean the point at which the sum of the deviations is equal to zero. page 22
35. What are Greek letters used to represent?
greek letter sigma, is the summation sign, which tells you to add together whatever follows it.
. used to represent population parameters ( such as the mean of a population)
36. The letter would be used to represent (a):
...
37. What are Roman letters used to represent?
sample statistic ( such as the mean of a sample)
38. The letter X with a bar over it is used to represent (a):
mean value of the group
39. Which of the following defines the Median?
defined as the midpoint in a set of scores. It is the point at which one half of the scores fall above and one half fall below.
40. What is the Median for the following amounts: $11.75, $12.75, $13.00, $10.75, $11.50, $10.50, $10.75?
11.50
41. What is the Median for the following amounts?: $13,400, $17,560, $45,440, $68,550, $96,400?
45,440
42. What is the Median of the following set of scores: 23, 17, 15, 32, 38, 47?
27.5
43. What is the Median of the following set of scores: 1.3, 4.7, 2.3, 3.3, 3.0, 2.9?
2.95
44. When there are an even number of scores, how is the Median calculated?
the median is simply the mean between the two middle values.
45. With regard to percentile points, what is the median also known as?
Q2
Q1 is the 25th percentile and Q3 is the 75th percentile
46. What is the 25th percentile also known as?
Q1
47. What is the 75th percentile also known as?
Q3
What symbols are used to represent the median?
Med or Mdn
What impact do extreme scores have on the median?
median is insensitive to extreme scores, whereas the mean is not.
Which of the following are used to define the percentage of case equal to and below a certain point in a distribution of scores?
75th percentile, it means that the score is at or above 75% of their scores in the distribution.
. median also known as 50th percentile because it's the point below which 50% of the cases in the distribution fall.
. other percentiles are useful 25th often called Q1
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