Statistics- Representation of Data

Question 1

What do all stem and leaf diagrams need?

Answer 1

A key

Question 2

Stem and leaf advantages

Answer 2

Good for lots of data
Orders data
Can calculate averages

Question 3

Stem and leaf disadvantages

Answer 3

Not informative for small data sets

Question 4

How do you calculate frequency density?

Answer 4

Frequency / Class width

Question 5

What’s the area of a histogram bar?

Answer 5

Frequency

Question 6

Histogram advantage

Answer 6

Good for representing continuous data

Question 7

Histogram disadvantage

Answer 7

Can’t get exact values as data is grouped

Question 8

Cumulative frequency advantages

Answer 8

Can find IQR and median

Shows a running total

Question 9

Cumulative frequency disadvantage

Answer 9

Difficult to compare

Question 10

How do you calculate outliers for box and whisker plots?

Answer 10

< LQ -1.5 x IQR

> UQ + 1.5 x IQR

Question 11

Box and whisker plot advantages

Answer 11

Shows spread
Can easily compare
Summarises large amounts of data

Question 12

Box and whisker plot disadvantages

Answer 12

Original data not clearly shown
Can’t calculate means and modes
Only for numerical data