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ID number:415598
 
Evaluation:
Published: 21.01.2004.
Language: English
Level: Secondary school
Literature: n/a
References: Not used
Extract

Random Sample
I drew 5 3-step stairs all of them were the same size, but they differed in position.
Comment:
1) Notice how all the totals are even
2) The totals increase the higher up the grid you go
3) Across goes up about 42 (92-50)
4) Up goes up about 420 (470-50)
Systematic Sample
I drew 5 stairs all on the bottom line going across, I did this to see if there was a pattern.
Comment:
There is clearly a pattern here; the totals are increasing by 6, we call this a linear sequence.

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