# Edexcel Maths Unit 1 revision- updated

After request, a more complete guide to edexcel maths. Hope it's useful for your revision. Good luck!

- Created by: Rachel
- Created on: 29-05-11 18:59

First 206 words of the document:

Unit 1 GCSE Maths- Edexcel

by Rachel Mander

Methods of Sampling

See sheet attached to this page.

Random samples:

Names in a hat

Numbered participants- random numbers for each item, computer generated

Each item has an equal chance of being selected

Other

Check sample size

Check the time of when the sample is taken

Check when it is taken

Check ages of participants

Stratified sampling

Example

2000 small caps

4000 medium caps

3000 large caps

1000 extra large caps

Total= 10000

Sample= 50

Small= 2000 x 50 = 10 caps

10000

Medium= 4000 x 50= 20 caps

10000

Large= 3000 x 50= 15 caps

10000

Ex Large= 1000 x 50= 5 caps

10000

In General:

No. to Take= subgroup size x sample size

Total

Discrete Data

Is any data which can only take a value from a given list. This is counted e.g. siblings.

Continuous Data

Is any data which can take any value in a given range. This is measured. E.g. weight (can get more

accurate)

Quantitative Data

Above are both types of this data, measured or counted.

Qualititive Data

Data about properties.

Mean

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