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18 Cards in this Set
- Front
- Back
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Σ |
Sigma. Summation symbol, means "add up". |
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x |
Variable usually used to represents individual data values. |
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n |
Represents the number of values in a sample. |
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N |
Represents the number of values in a population. |
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Σx |
Means add up all the values x can assume. |
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Σx^2 |
Means square each value that x can assume, then add up the result. |
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(Σx)^2 |
Means add up all values x can assume then square the results. |
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n / N |
Number of values in data set. Sample / Population |
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s / σ |
Standard deviation. Sample / Population. |
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_ x / µ |
Mean. Sample / Population. |
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p̂ / P |
Proportion. Sample / Population. |
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Mean |
Measure of center.
Sample: x̄ = (Σx)/n Population: µ = (Σx)/N |
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Median |
Measure of center. 1). Arrange all values in numerical order. 2). If the number of data values is odd, the median is the number that is located in the exact center of sorted list. 3). If the number of data values is even, the median is is the mean of the center two numbers. |
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Mode |
Measure of center. The value that occurs the most. Bimodal is when there are two values that occur the same amount and more then once. Multimodal when there are more then two modes. No Mode is when no scores are repeated. |
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Midrange |
The value midway between the maximum and minimum values in the data set. (max-min)/2 |
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Weighted Mean |
Mean computed when different x data values are assigned different different weights w. x̄ = (Σ(wx))/Σw |
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Range |
The difference between the maximum value and minimum value. |
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Standard Deviation |
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