Sampling Of Location Flashcards
1
Q
Measure of location
A
Single values that describe a positions in a data set
2
Q
Measure of spread
A
Involved with how data is spread out
3
Q
Measures of central tendency
A
Involved with the centre of data (mode, median, mean)
4
Q
Examples of measures of location
A
Minimum
Maximum
Quantiles
Percentiles
Deciles
5
Q
Examples of measures of spread
A
Range
Standard deviation
Interquartile range
Variance
6
Q
Mean
A
X = EX / n
7
Q
Mean in a frequency table
A
X = Efx /Ef
8
Q
How to find median in frequency table
A
(Frequency + 1) / 2
This gives the position of the median
Use cumulative frequency
Add frequencies until, you reach beyond the point
The class width would be the one greater than the calculated position.
9
Q
Notations for percentiles
A
LQ = Q1
Medium = Q2
UQ = Q3
nth percentile = Pn
