: Data (Grouped and Ungrouped) and Summary Statistics Flashcards
1
Q
A frequency polygon…
A
passes through centre of rectangles
starts and finishes centred on previous or next value
2
Q
A cumulative frequency polygon (ogive)…
A
passes through right hand top corner of rectangles
starts at bottom left corner
3
Q
What does a pareto chart consist of
A
two graphs:
- a frequency histogram with columns arranged in descending order
- a cumulative frequency polygon (as percentages)
4
Q
What is the mode
A
Measure of location: most popular score
5
Q
What is the range
A
Measure of spread: The difference between the min and max score
6
Q
What does a box and whisker plot consist of
A
Min value, Q1, Q2, Q3, max value
7
Q
What is the interquartile range
A
Difference between the upper and lower quartiles (Q3-Q1)
8
Q
What is an outlier
A
Lies outside the upper or lower fence
Lower = Q1-1.5xIQR
Upper = Q3+1.5xIQR
