200059
Descrição
Mapa Mental por shirley.ha, atualizado more than 1 year ago
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Criado por shirley.ha
mais de 11 anos atrás
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Measures of dispersion
- tell us how spread or dispersed the data are.
- indicate the spread or variety of people’s measurements in a distribution.
- Low dispersion
- values are similar
- values are similar
- High dispersion
- wide range of different values
- wide range of different values
- Low dispersion
- indicate the spread or variety of people’s measurements in a distribution.
- Range
- highest no/- lowest no
- use of range is limited, because it tells us
nothing about how the data between these
two extremes are spread.
- highest no/- lowest no
- Percentile
- divide the data into 100 equal
parts with equal numbers of
observations in each part.
- help us to provide information
about the location of a score in
respect to other scores.
- score at or below a certain percentage of
scores lying in a distribution
- Quartiles
- sets of values that divide the
distribution into four parts such equal
number of observations in each part
- Q1
- 25%
- lower quartile
- lower quartile
- 25%
- Q2
- 50%
- median
- median
- 50%
- Q3
- 75%
- upper quartile
- upper quartile
- 75%
- sets of values that divide the
distribution into four parts such equal
number of observations in each part
- divide the data into 100 equal
parts with equal numbers of
observations in each part.
- IQR
- is the companion to the median.
- indicates the range of values spanned by the middle
50% of the observations
- Q3-Q1
- is the companion to the median.
- Standard deviation
- the companion to the mean.
- indicates the average distance or
amount, by which each observation
differs from the mean.
- descriptive statistic that
is the most commonly
used measure of
dispersion or spread
- denoted by σ, in the
population and SD or
s in the sample
- used with the mean to
describe the distribution of
observations.
- most widely used measure of dispersion,
particularly with interval and ratio level
data
- most widely used measure of dispersion,
particularly with interval and ratio level
data
- descriptive statistic that
is the most commonly
used measure of
dispersion or spread
- the companion to the mean.
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