# S2 definitions

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• Created by: Sophie :)
• Created on: 22-06-14 10:00
Population
collection of ALL individual items
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Sample
selection of individual items from a population
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Finite population
Each member can be given a number
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Infinite population
Impossible to assign a number to every member of the population
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Sampling unit
individual member of the population
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Sampling frame
List of ALL sampling units
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Statistic
A quantity calculated solely from the observations in a sample. There are no unknown parameters.
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Sampling distribution
The probability distribution of all possible values of a test statistic, from all possible samples
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Hypothesis
A statement about a population parameter
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Null hypothesis
statement we assume is true unless proven not true
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Alternative hypothesis
A statement that tells us about the value of the statistic if Ho is proven wrong
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Critical region
The range of values of the statisic that lead to rejecting Ho
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Critical values
The values on the boundaries of the critical region
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Hypothesis test
A mathematical procedure to examine the value of a population parameter, proposed by the Ho compared to H1
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One tail test
Looks for an increase OR decrease in the parameter. Only critical value.
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Two tail test
Looks for an increase AND decrease in the parameter. Two critical values.
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Actual level of significance
Probability of incorrectly rejecting Ho
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Actual level of significance
Probability of incorrectly rejecting Ho
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## Other cards in this set

### Card 2

#### Front

selection of individual items from a population

Sample

### Card 3

#### Front

Each member can be given a number

### Card 4

#### Front

Impossible to assign a number to every member of the population

### Card 5

#### Front

individual member of the population