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OHS
HD3a/1: Raw Data
Use to pose as many quick-fire questions about the
raw data as possible in 3 minutes, eg:
How many numbers between 1 and 7?
How many numbers bigger than 6 …
Repeat after placing list in order (Column 2).
(Q: Which is easier
/ faster / more accurate?) |
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- To be able to
decide which data is suited to an enquiry.
- To be able to design collection sheet or questionnaire
and frequency tables (including grouped data). |
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data
primary data
secondary data
grouped data
discrete data
frequency
diagram |
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Introduce a statistical
problem.
Eg1: 'Boys' & Girls' TV Habits: is there a Difference?
'Eg 2: West
Midland Road Accident Data
Cross-curricular with Citizenship and PSHE. (Access/Excel).
a) Brainstorm with pupils what data they wish to
collect; decide which suggestions best address the
original question.
b) Brainstorm possible data sources (TV companies,
teen magazines, newspapers, internet, survey …).
Primary v secondary sources.
c) Discuss and decide on data collection sheet;
grouped or not. |
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Deciding,
Planning & Collecting
Eg: 'Boys' & Girls'
TV Habits: is there a Difference?'
OR
West
Midland Road Accident Data
a) Briefly record decisions made about type of data
and method of collection.
Eg: Which of these types of programmes do you watch:
…? How many hours
TV per night?
b) Collect data using data collection sheet, grouping
data if appropriate.
OR International
Survey
- take part in for enrichment.
OR Class
Breakfast Habits
- for surveys & questionnaires. |
|
Review steps in
the planning stage:
1) Decide on relevant
data;
2) Research possible
data sources;
3) Plan data collection
sheet;
4) Design data collection
sheet.
Discuss possible biases of the sources suggested. |
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|
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OHS
HD3a/1: Raw Data
Ask pupils to round each measurement to:- nearest
whole number
- 1 d.p.
- 2 d.p. |
|
- To be able to
draw bar charts (grouped discrete data).
- and pie charts using ICT.
- and compound bar charts for categorical data.
- and bar-line graphs for discrete data. |
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bar
chart
bar-line graph
pie chart
group
distribution |
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1. Discuss next
stage:
a) the nature of the collected data – numerical,
categorical, grouped..;
b) how to use it to answer Q?
c) most efficient way? (cf: Starter).
d) Highlight different display uses - - pie charts
compare 'part' with 'whole'; - bar charts compare
'part' with part'.
2. Demonstrate how to draw each chart. |
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Constructing
Statistical Diagrams
Eg: Bar charts for TV Viewing
Times (1-3, 4-6 ... daily viewing). Input
on choice of chart scales.
Eg: Pie charts for TV Preferences
(Soaps, Films, News, Cartoon …) Highlight
that best use is with
small number of categories. |
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Review decisions
on
- choice of displays;
- choice of scales;
- choice of groupings. |
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