2. Summarising and analysing data - 1

Question 1

ACCURATE

Answer 1

Accurate
Complete
Cost Effective
Understandable
Relevant
Accessible
Timely
Easy to use

Question 2

Grouped distributions

Answer 2

putting a tally system into a range or class

Question 3

work out angles on a pie chart

Answer 3

work out each segment as a % of the total

take % and x 3.6 to give you angles of pie chart

Question 4

Multiple bar chart

Answer 4

shows two or more different sets of data against each other

Question 5

Compound bar chart

Answer 5

Shows each set of data in the same bar

Question 6

Histogram

Answer 6

Frequency is measured by the area of a block or rectangle in a bar chart

x axis is the variable being measured (horizontal)
y axis if the corresponding frequency (vertical)

Question 7

Ogive

Answer 7

a graph of cumulative distribution, which shows data values on the horizontal axis and either the cumulative frequencies, the cumulative relative frequencies or cumulative percent frequencies on the vertical axis.

Question 8

Discrete data

Answer 8

only certain values i.e. shoe size

Question 9

Continuous data

Answer 9

any value i.e. foot size

Question 10

Unequal class size

Answer 10

area of each block must reflect the frequency
how to work out the height
frequency x (standard width / actual width)

Question 11

Standard width

Answer 11

most common width

Question 12

Pareto 80-20 rule

Answer 12

Small proportion of population own the large portion of the overall wealth

Using this rule helps us to identify out biggest customers

Question 13

Frequency polygon

Answer 13

A frequency polygon gives the idea about the shape of the data distribution.
The two end points of a frequency polygon always lie on the x-axis.