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9 Cards in this Set

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  • Back

three major properties or characteristics which describe a set of data pertaining to some variable of interest

  1. location
  2. dispersion
  3. shape

if these properties (location, dispersion, shape) are computed from the observations associated with a sample of data, they are called...

statistics

if these properties (location, dispersion, shape) are computed from an entire population of data, they are called...

parameters

three typical measures of location

  1. sample mean
  2. sample median
  3. sample mode

samples can have the same __________ and the same _______, yet have different measures of _________

samples can have the same level of dispersion and the same shape,yet have different measures of location

samples can have the same level of dispersion and the same shape, yet have different measures of location

sample mean

  • commonly acts as a balancing point, where observations which are larger balance out observations which are smaller
  • based on every observation so extreme values in the sample affect the sample mean

sample median

  • useful when extreme values tend to distort the sample mean...unaffected by extreme values
  • represents the value in the middle of a sorted set of values...half of the observations are greater than the median, and half are lower

if the number of observations is even, the median represents...

the average of the two middle observations

sample mode


  • the most commonly observed value in the set of sample values
  • reflects the value that occurs with the greatest frequency
  • as with the sample median, the mode is unaffected by extreme values
  • the only measure of central tendency or location that can be used with qualitative data