Term
| Approximate population mean, mew = |
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Definition
Summation[(xi)(fi)]/summation(fi)
where xi = midpoint of the i-th class
fi = frequency of the i-th class |
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Term
| Approximate sample mean, xbar = |
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Definition
Summation[(xi)(fi)]/summation(fi)
where xi = midpoint of the i-th class
fi = frequency of the i-th class |
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Term
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Definition
| Computing the mean when certain data values have a higher importance or weight associated with them |
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Term
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Definition
| Summation[(wi)(xi)]/summation(wi) |
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Term
| Approximate population variance, sigma^2 = |
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Definition
Summation[(xi-mew)^2 x fi]/summation(fi)
where xi = midpoint of the i-th class
fi = frequency of the i-th class |
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Term
| Approximate sample variance, s^2 = |
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Definition
Summation[(xi-xbar)^2 x fi]/summation(fi)-1
where xi = midpoint of the i-th class
fi = frequency of the i-th class |
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