# Stats Unit 1 Flash Cards

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Quantitative Data
Is the type of data that give numerical results
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Qualitative Data
Is the type of data that gives non-numerical results
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Discrete Numerical Data
Is the type of data that can only be whole numbers
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Continuous Data
Is the type of data that can take any value on a scale
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Rounding
Is when continuous data is taken to a more sensible unit
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Population
Is the thing that can be investigated/involved in an investigation`
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Census
Is when the whole population is used
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Sample
Is when the population is too big so a smaller amount is used
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Simple Random Sampling
Is when all in the population has an equal chance of selection
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Stratified Sampling
Is when the population is divided into sub-populations, so need to get equally represented
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Cluster Sampling
Is when the population naturally divides into groups. Some groups are chosen and observed
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Quota Sampling
Is when a certain number of people are interviewed, depending on certain combinations of characteristics
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Systematic Sampling
Is when every Nth person on the list is taken
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Convenience Sampling
Is when any convenient form of sampling is done
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Primary Data
Is when the data is collected for/by the person using it
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Secondary Data
Is when the data is collected by someone else
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Surveys
Is a questionnaire/set of observations
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Pilot Surveys
Is conducted on a small sample, to raise any issues in the questionnaire
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Questionnaire
Is when questions are used to collect data
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Open Question
Is when a question has no suggested answers
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Closed Question
Is when a question has a range of answers to choose from
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Post Interviews
Is when a questionnaire is sent through the post
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Telephone Interviews
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Face-to-Face Interviews
Is when the interviewer approaches people to ask the questions
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Before and After Experiments
Is when the group is observed, then change happens, and then the group is observed again
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Control Groups
Is when one group is affected by the change and another group is used as a comparison
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Matched Pairs
Is when an individual from one group is paired with an individual from the other group.
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Capture/Recapture Method
Is usually used to estimate the number of organisms in a habitat
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## Other cards in this set

### Card 2

#### Front

Is the type of data that gives non-numerical results

Qualitative Data

### Card 3

#### Front

Is the type of data that can only be whole numbers

### Card 4

#### Front

Is the type of data that can take any value on a scale

### Card 5

#### Front

Is when continuous data is taken to a more sensible unit