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29 Cards in this Set
- Front
- Back
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Bivariate data |
Data that involve two variables |
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Data |
Information that has been collected |
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Discrete data |
Data that can take only certain numerical values in a given range |
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Continuous data |
Data that can take any value in a given range |
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Hypothesis |
An assumption made as the starting point of an investigation |
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Qualitative data |
Observations that do not have numerical values e.g colour |
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Quantitative data |
Observations that can take numerical values |
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Variable |
A quantity that can have different values |
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Census data |
Information about every member of the populatiom |
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Population |
Everybody or everything that could be involved in an investigation |
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Random sample |
A sample in which the people or items are chosen without making a conscious decision. Each person has an equal chance of being selected |
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Sample data |
Information about part of the population |
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Sampling frame |
A list of all the people or items in the population |
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Sampling units |
All the people or things in a population |
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Stratified sampling |
With stratified sampling, the researcher divides the population into separate groups, called strata. Then, a probability sample (often a simple random sample ) is drawn from each group. The amount drawn from each group varies with the number in each group and the population; it is calculated - number in stratum ÷ number in population × number in sample |
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Cluster sampling |
A sample of groups is randomly selected and observations are taken on each member of each group for data. |
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Qouta sampling |
Pre-specified numbers of the population are taken with certain combinations of characteristics, such as sex, age ect. |
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Systematic sampling |
Every nth person or unit is selected on an unordered list starting from a random starting point |
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Closed question |
A question that has a set of answers to choose from |
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Leading question |
A question that leads to respondent to agree |
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Open question |
A question that gives no suggested answers |
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Pilot survey |
A small scale survey done to find out if the main survey will work |
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Primary data |
Data collected by or for yourself |
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Secondary data |
Data collected by someone else for their own use |
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Before and after experiment |
An experiment in which the situations before and after are compared |
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capture/recapture |
A way of measuring the size of a population |
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Control group |
A randomly selected group that is not subject to any procedures being tested |
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Data logging |
Automatic reading of data at regular intervals |
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Matched pairs |
Two samples in which members are matched e.g identical twins |
