Analysis of discrete

data

13

Contents:

A Variables used in statistics [11.2]

B Organising and describing

discrete data [11.2, 11.3]

C The centre of a discrete data set [11.4]

D Measuring the spread of discrete data [11.4]

E Data in frequency tables [11.4]

F Grouped discrete data [11.4]

G Statistics from technology [11.8]

Historical note

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² Florence Nightingale ( 1820 - 1910 ), the famous “lady with the lamp”,

developed and used graphs to represent data relating to hospitals and

public health.

² Today about92%of all nations conduct a census at regular intervals.

The UN gives assistance to developing countries to help them

with census procedures, so that accurate and comparable worldwide

statistics can be collected.

Opening problem #endboxedheading

A stretch of highway was notoriously dangerous, being the site

of a large number of accidents each month.

In an attempt to rectify this, the stretch was given a safety

upgrade. The road was resurfaced, and the speed limit was

reduced.

To determine if the upgrade has made a difference, data is

analysed for the number of accidents occurring each month for

the three years before and the three years after the upgrade.

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Y:\HAESE\IGCSE01\IG01_13\275IGCSE01_13.CDR Thursday, 2 October 2008 12:14:31 PM PETER