summarizing data Flashcards
what do descriptive statistics include ?
measures of central tendency
measures of dispersion
what are the measures of central tendency ?
the mean
the mode
the median
which of the measures of central tendencies are used for extreme values ?
the median
what is the best measure of central tendency overall v?
the mean
what are the advantages of the mean ?
the mean takes all the values into consideration
what is the disadvantge of the mean ?
is distorted by extreme values
what is the advantage of the median ?
not affected by extreme values
what are the disadvantages of the median ?
doesn’t take all the values into consideration
what is the advantage for the mode ?
can be used for both qualitative and quantitative data
what are the disadvantages of the mode ?
there may be more than one mode
there may be no mode at all for the data
what are the measures of dispersion ?
the range
the variance
the SD
the coefficient of variation
what is the range ?
the difference between the largest and the smallest value
what is the variance a measure off ?
how close the observed value is from the arithmetic mean
variance of the data is small when ?
observations are close to the mean
variance of the data is large when ?
observations are far from the mean
