measures of central tendency, dispersion, location Flashcards
1
Q
- compressing mass of data for better
comprehension and description.
A
summary measures
2
Q
- Refers to “center” of the distribution of
observations.
A
measures of central tendency
3
Q
- also known as average
A
mean
4
Q
- sensitive to extreme observations.
- involves all observation in its computation.
- any change in the observation will change the mean value.
A
mean
5
Q
- middle most value in a set of observations put in an array
- always exists and is unique.
- not influenced by outliers.
- does not make use of all the observations in its
computation. - can be calculated for any quantitative and qualitative variable.
A
median
6
Q
most frequently occurring value in a set of observations
A
mode
7
Q
- gives information as to the tendency of values to
clump together. - tools describing the variability of the
observations.
A
measures of dispersion
8
Q
Simplest measure of location
A
range
9
Q
highest observation – lowest observation
A
range
10
Q
does not tell anything about the observation between these two extreme observations.
- may be used for quantitative variables
A
range
11
Q
Measure of variability that takes the mean as the reference point
A
variance
12
Q
- involves all observations.
- unit: squared unit of the original set of observations.
- hard to interpret
A
variance
13
Q
- square root of variance
- unit is the same as that of the original set of observations.
A
sd
14
Q
square of variance
A
sd
15
Q
expresses the SD as percentage of mean.
A
coefficient variation
