# S2 key definitions

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• Created by: Sophie
• Created on: 16-02-15 15:09
population
collection of all individual people or items
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finite population
population of a discernible size e.g. pupils at a school
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infinite population
population of infinite/indiscernible size e.g. grains of sand on a beach
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countably infinite population
population with a countable number of elements but counting up to reach one such element could take forever e.g. no of throws of a dice before a 6 is obtained
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Census
an investigation which obtains information from all members of the population
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sample
a group of individuals which form a subset of the population
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sample survey
an investigation using a sample
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sampling units
the individual units of a population (i.e. each child in a class would be a sampling unit)
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sampling frame
a list/index of all sampling units
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population parameter
any measurable characteristic of a population
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statistic
a quantity which is a function of a set of observations which does not involve any unknown parameters
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sampling distribution
the probability distribution of a statistic which gives all its possible values and the probability of each occurring
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test statistic
summary of the evidence from a sample
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null hypothesis
the hypothesis we assume to be correct unless there is evidence otherwise, H0
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alternative hypothesis
hypothesis which tells us about the value of a population parameter should we reject H0
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critical region
the set of values of the test statistic for which H0 is rejected in a hypothesis test
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significance level
the probability of rejecting H0
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## Other cards in this set

### Card 2

#### Front

population of a discernible size e.g. pupils at a school

#### Back

finite population

### Card 3

#### Front

population of infinite/indiscernible size e.g. grains of sand on a beach

### Card 4

#### Front

population with a countable number of elements but counting up to reach one such element could take forever e.g. no of throws of a dice before a 6 is obtained

### Card 5

#### Front

an investigation which obtains information from all members of the population