Representing Data

Question 1

What is a multiple bar chart?

Answer 1

Bar chart showing the relationship between different values of data in the same category

Question 2

What is a composite bar chart?

Answer 2

Bar chart where each bar is divided into multiple sections of data

Question 3

How do we find the size of each category in a pie chart?

Answer 3

Frequency of category/total frequency x 360

Question 4

What is a comparative pie chart?

Answer 4

1. Two circles are drawn with areas proportional to the two total frequencies - these charts are more representative of the total frequency
2. To compare frequencies, compare areas
3. To compare proportions, compare individual angles

Question 5

What formula is used to construct a comparative pie chart?

Answer 5

r1 = r2 x (√F1/ √F2) and vice versa

• where r1/F1 is the radius/total frequency of the first circle
• where r2/F2 is the radius/total frequency of the second circle

Question 6

What is a population pyramid?

Answer 6

A chart showing the age groups in a population

Question 7

What is a chloropleth map?

Answer 7

Map showing shaded regions of a geographical area

Question 8

What is a histogram?

Answer 8

1. A bar chart that represents continuous rather than categorical data.
2. There is no gap between the bars.
3. Shows how data is distributed across class intervals

Question 9

What is a frequency polygon?

Answer 9

Lines drawn joining the midpoints of the bars of a histogram

Question 10

What is cumulative frequency?

Answer 10

A running total of the frequencies of each class interval

2. Discrete data: cumulative step polygon
3. Continuous data: cumulative frequency curve

Question 11

How do we draw a cumulative frequency curve?

Answer 11

Plot the c.f (y) at the top boundary of every class interval