# GCSE Statistics - collecting data terms

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Raw Data

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## Tags and Description

### 19 Terms

1

Raw Data

Data just as it is collected - before it is ordered or grouped.

Can be either quantitative or qualitative.

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2

Quantitative Data

Numerical observations or measurements.

• Numbers

• Is either continuous or discrete

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3

Qualitative Data

Non - numerical observations.

• Often words

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4

Continuous Data

Can take any value on a continuous numerical state.

• e.g. measurements

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5

Discrete Data

Can only take particular values on numerical scale

• shoe size or number of pets

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6

Ordinal Data

Can be written in order or can be given a numerical rating scale.

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7

Bivariate Data

Involves pairs of related data.

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8

Multivariate Data

Involves sets of 3 or more related data values.

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9

Primary Data

Data collected by or for the person who is going to use it.

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10

Secondary Data

Data collected by someone else

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11

Population

Everything or everybody that could be involved in an investigation

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12

Census

A survey or investigation with data taken from every member of a population

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13

Sample

Contains information about part of a population. The results can be used to make conclusions for the whole population.

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14

Hypothesis

An idea that can be tested by collecting and analysing data.

• Should be a statement not a question

• Needs to be precise about something you can measure.

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15

Explanatory or Independent Variable

What a researcher changes

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16

Response or Dependant Variable

Is affected by the explanatory variable

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17

Extraneous Variable

Need to be controlled, could affect results of the experiment

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18

Field experiments

Carried out in an everyday (uncontrolled) environment. Researcher sets up the situation and variables are controlled.

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19

Natural experiments

Carried out in an everyday (uncontrolled) environment. The researcher has no control over any variables.

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