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 Form 4 Geography online lessons on statistical methods

Steps followed when constructing an age-sex pyramid

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Answer Text:
Steps followed when constructing an age-sex pyramid.
Step 1
Identify the respective sexes from the table given.
Step 2.
Establish the number of cohorts in the population.
Step 3.
Determine the number or percentage males and females in each cohort.
Step 4.
Using the number of males and females in the cohort,
choose an appropriate horizontal scale.
Step 5.
Choose an appropriate vertical scale as determined by total number of cohorts.
The bars should not be too wide or too narrow.
Step 6
Using a graph paper, draw two vertical parallel line at the centre of the paper with 2 cm space between them.
-At the base of the right line, draw an horizontal line to the right and do the same to the left line.
Step 7
In the 2cm space indicate the cohorts beginning with the lowest age-group in ascending order.
Step 8
On the horizontal line to the right mark 0 at the point of intersection between vertical and horizontal lines increasing the value to the right. On the horizontal line to the left, do the same.
Mark the cohorts to right to represent females and to the left to represent males.
Step 9
Draw the respective bars in each cohort and shade them neatly.
Step 10
Frame the age-sex pyramid and give it a title.


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