# Statistics - data collection & sampling

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• Created by: Nikki
• Created on: 28-03-13 21:53
Data that hasn't been collected/interpreted by someone else
Primary Data
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Data that has been collected/interpreted by someone else
Secondary data
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Numerical data, e.g. time, shoe size
Quantitative
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Descriptive data, e.g. eye colour, car colour
Qualitative
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Countable data, e.g. no. of points scored, no. of blue cars
Discrete
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Data that can't be measured accurately, e.g. height, weight
Continuous
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Data that measures two things
Bivariate data
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An entire collection of people, animals, plants or things from which we may collect data
Population
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A list of all the members of the population
Sampling frame
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Collecting data from every member of the population
Census
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Quicker and cheaper alternative to a census
Sample
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Type of sample - sampling people/items taken by choosing every Nth item
Systematic
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Type of sample - a sample where the no. chosen from each group is proportional to the no. of people in the group
Stratified
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Type of sample - a sample where the poplulation is split into groups (e.g. town) and then a random sample of the groups is taken
Cluster
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Type of sample - a sample where the population is split into categories (e.g. age, gender) and a certain number from each group has to be sampled
Quota
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Type of sample - a sample taken from a selection of the population present at the time of the sample
Convenience
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Type of sample - a sample where every member of the population has an equal chance of being chosen
Simple random
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A systemic inaccuracy in data due to the characteristics of the process employed in the creation, collection, manipulation, or presentation of data, or due to faulty sample design of the estimating technique.
Bias
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A statement that you believe to be true but you have not yet got evidence for
Hypothesis
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Method of collecting data - asking questions to the members of the sample
Questionnaire
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Method of collecting data - doing an experiment, e.g. measuring height or weight
Experiments
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Type of question that allows any type of answer
Open
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Type of question that has a fixed number of possible answers
Closed
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Type of question, e.g. do you agree that One Direction are a good band?
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A small survey taken in advance of a major investigation/sample
Pilot survey
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## Other cards in this set

### Card 2

#### Front

Data that has been collected/interpreted by someone else

Secondary data

### Card 3

#### Front

Numerical data, e.g. time, shoe size

### Card 4

#### Front

Descriptive data, e.g. eye colour, car colour

### Card 5

#### Front

Countable data, e.g. no. of points scored, no. of blue cars