D2 Median and Quartiles Flashcards
1
Q
What does the distance between the lowest and highest value (two ends) represent on a box plot diagram?
A
The range.
2
Q
How do you get the median value on a cumulative frequency diagram?
A
Total cumulative frequency / 2.
3
Q
How do you get the lower quartile value on a cumulative frequency diagram?
A
Total cumulative frequency / 4.
4
Q
How do you get the upper quartile value on a cumulative frequency diagram?
A
Lower quartile cumulative frequency x 3.
5
Q
How do you get the interquartile range value on a cumulative frequency diagram?
A
Upper quartile - lower quartile.
6
Q
What summary statistics could you use to compare data sets of box plots?
A
- the measure of average (median), which one is higher.
- a measure of either the biggest range or biggest interquartile range.
- skewness (left hand side of box bigger = negatively skewed, right hand side of box bigger = positively skewed)
7
Q
What does the box width represent on a box plot?
A
The interquartile range.
