Edexcel GCSE Statistics - Key Terms Guaranteed Success
What is a census? ️️A census is a survey of a whole population rather than just a small part of it
What is a sample? ️️A sample is a survey of a small part of the population rather than the whole
population
Why do we use samplin...
What is a census? ✔️✔️A census is a survey of a whole population rather than just a small part of it
What is a sample? ✔️✔️A sample is a survey of a small part of the population rather than the whole
population
Why do we use sampling? ✔️✔️We use samples because they are:
• cheaper,
• quicker and
• easier to manage than using the whole population
What does random mean? ✔️✔️Random means that every member of a population has an equal
chance of being chosen
What is bias? ✔️✔️Prejudice for or against one group or opinion or result in a way that is 'unfair'
Describe how to take a random sample of 50 from 1000 pupils in a school ✔️✔️Give every pupil pupil
a unique number using the school register. Use a random number generator to select 50 random pupil
numbers
Why do we use stratified sampling? ✔️✔️Stratified sampling ensures each group in a population is
represented in proportion to its size
What is a hypothesis? ✔️✔️A hypothesis is an idea or opinion that you start with, and which you test
using statistical techniques e.g. "Gromow makes plants grow taller"
What is qualitative data? ✔️✔️Qualitative data relates to the qualities of something e.g. colour,
texture, style, name
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