3 Summarising Data Flashcards
1
Q
average
A
a single value used to describe a set of data
- a measure of central tendency
2
Q
mean in a frequency table
A
Σfx / Σf
3
Q
how is median different for grouped continuous data / large data sets
A
it is the 1/2 nth value
4
Q
mean in a grouped frequency table
A
∑(midpoint × f) / ∑f
5
Q
geometric mean
A
n root of value 1 + value 2 ….
6
Q
weighted mean
A
Σwx / Σw
7
Q
measures of dispersion
A
range, IQR
8
Q
linear interpolation
A
9
Q
standard deviation
A
10
Q
standard deviation from frequency table / grouped data
A
11
Q
outlier (normal)
A
12
Q
outlier (standard deviation)
A
13
Q
using mean, median, mode for skew
A
14
Q
calculating skewness
A
3(mean - median) / standard d.
15
Q
mode pros and cons
A
16
Q
median pros and cons
A
17
Q
mean pros and cons
A
18
Q
when comparing which average, compare which measure of spread
A
19
Q
A
