02 Processing and representing Data

Question 1

Define database

Answer 1

A collection of information

Question 2

What does a two-way table do?

Answer 2

Shows information is 2 different categories

Question 3

What does a pictogram do?

Answer 3

Uses symbols or pictures to represent a number of items

Question 4

Describe the 3 components of a bar chart (bars; frequency)

Answer 4

• bars are equal width
• bars have equal space between them
• height of the bar represents the frequency

Question 5

what is a composite bar chart?

Answer 5

• compares data for each category in a single bar, divided into components that show the frequency for each part

Question 6

what do bar charts and verticle line graphs show?

Answer 6

trends//patterns in data

Question 7

What do population pyriamids show?

Answer 7

gae group in a population, usually classified by gender

Question 8

What is a cloropleth map used for?

Answer 8

to classify region of geographical data (can be a diagram raather than an accurate map)

Question 9

How do you find the frequency density?

Answer 9

Frequency density = frequency/ class width

Question 10

where do you plot the points of a frequency polygon?

Answer 10

the midpoints of the bars on a histogram

Question 11

What do the angles in a pie chart add up to?

Answer 11

360*

Question 12

How do you find the are of a circle//pie chart?

Answer 12

area =πr^2

Question 13

Give the equation for comparative pie charts

Answer 13

r2 = r1(√F2/√F1)

Question 14

Why is the first point on a cumulative frequency diagram plotted on the lower bound of the first group?

Answer 14

To show that there is no frequency beyond that point

Question 15

which way does a negative skew curve?

Answer 15

starts low, swoops high

Question 16

which way does a positive skew curve?

Answer 16

starts high, swoops low

Question 17

List 3 reasons why a graph can be misleading:

Answer 17

(any from the following):
- Scales that do not start at zero, or have parts of them missed out, giving a misleading impression of the heights of the bars, etc.
- Slaces that do not increase uniformly distort the shape of anything plotted on them
- thick lines on the graph that make it difficult to read information
- Axes without labels prevent you from knowoing what the data represents
- graphs and charts without keys make it may be impossible to imterpret
- colours may make some parts of a graph/chart stand out more than others