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13 Cards in this Set

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frequency distribution
constructed by classifying indicidual obs into categories corresponsing to fixed numeric intervals and plotting the # of observations in each catgeory versus category descriptor
normal distribution
[median = mena]
data desc by a bell shape (gaussian) curve w/ a max

population mean

best estimate of true value
accuracy
degree w/c measured value

agrees w/ true value
error (bias)
difference between a measured value and true value
median
midmost value of data distribution

less affected by "outliers" or skewed distribution
mode
most frequently occuring value useful for non-normal
population variance
used to desc the variability or spread of obs in a data dist
finite # of observations
samples variance (s2)

can be used to desc variability or spread of observations in data distribution
range
used to desc the variability in data set

largest-smallest
std deviation
most common encountered estimate of variability

equal to square root of variance
precision
(reproducibility)
degree w/c replicated measurements made in exactly the same way agree w/ each other

often expressed as relative std dev (rsd, %rsd)
% RSD
(S/X) X 100
std deviation of mean

std error of the mean
- estimate of variability or error in the mean obt fr n obs

-used to establish confidence intervals for desc the mean of a data set or when comparing the means of 2 data sets