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14 Cards in this Set
- Front
- Back
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what is Σx |
The sum of all scores |
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What are the 4 types of data |
1) nominal data putting things into categories and naming. 2)ordinal data putting categories into order. 3) interval data to scale between categories. 4)ratio data is relative to a true zero point |
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to ddescribe data you need to be able to do what two things |
describe what you see and use the data to create a frequency distribution |
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what are the five characteristics of distribution |
1) one group or more? 2) how many scores represented? 3) what is the shape? 4)measures of central tendency? 5) measures of central? |
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what is the mode |
the value occurring more often. |
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what are the positives and negatives of the mode |
It can be used with any type of data but it is not useful for parametic tests |
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what is the median |
it is the middle of a set of observations |
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what are the (-) and (+) of the median |
It can be used with ordinal, interval, or ration data but not bimodal distribution or parametic tests |
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what is the mean |
is is the sum of all observations divided by the number of observations. M= Σx/N. The sum of all the deviations around the man is equal to zero. Σ(x-M)=0 |
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What are the (+) and (-) of the mean |
supports parametic tests but uses only interval or ratio data and is vulnerable to extreme scores |
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what is the range |
the largest value minus the smallest, tells us the values but not the shape |
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what is the interquartile range |
it tells us where the middle 50% of the scores lies |
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what does the variance do |
It tells us the mean squares deviation about the mean. It needs interval or ratio data |
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what is the standard deviation |
The square root of the variance |
