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13 Cards in this Set

  • Front
  • Back
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
degree w/c measured value

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

less affected by "outliers" or skewed distribution
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
used to desc the variability in data set

std deviation
most common encountered estimate of variability

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

often expressed as relative std dev (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