# OCR Maths: S1- Definitions

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• Created by: Sam
• Created on: 06-06-16 14:18
Qualitative
A variable that cannot take a numerical value i.e hair colour
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Quantitative
A variable that can take a numerical value
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Continuous
A quantitative variable that can take any value within a range i.e time
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Discrete
A quantitative variable that can only take certain values i.e number of cars
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Frequency Density (Equation)
Frequency of the class/Class width
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Box-and-Whisker Plot
A visual display of the five number summary. The box-and-whisker plot is a simplified boxplot taught to beginners . It does not show outliers. The whiskers extending all the way to the minimum and maximum values regardless of how far out they may be
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Outlier
A value that is distinctly separate from the majority of the values
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Median
The middle value in a ranked set of data
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Mean
The sum of the values in the data divided by the number of values
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Mode
The value in a set of data with the highest frequency
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Modal Class
The class with the highest frequency density (in grouped frequency tables)
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Range
Largest value - smallest value
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Interquartile Range
Upper quartile - Lower quartile
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Variance
The average of the squared differences from the mean
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Standard Deviation
A measure of how spread out a set of values is from the mean
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Sample Space
A set of all possible outcomes in an experiment (written in "{ }")
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Outcome
A single, specific possible result of an experiment
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Event
A set of possible outcomes resulting from a particular experiment
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Mutually Exclusive
Events that cannot happen at the same time
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A method for finding the probability that either or both of two events occurs.
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Multiplication Law of Probability
A method for finding the probability that both of two events occur.
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Independent Events
Events for which the probability of any one event occurring is unaffected by the occurrence or non-occurrence of any of the other events
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Conditional Probability
A probability that is computed based on the assumption that some event has already occurred. The probability of event B given that event A has occurred is written P(B|A)
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Combination
A selection of objects from a collection. Order is irrelevant
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Permutation
A selection of objects in which the order of the objects matters
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Factorial
The product of a given integer and all smaller positive integers
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Random Variable
A quantity whose value depends on chance
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Least Squares
The linear fit that matches the pattern of a set of paired data as closely as possible. Out of all possible linear fits, the least-squares regression line is the one that has the smallest possible value for the sum of the squares of the residuals
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## Other cards in this set

### Card 2

#### Front

A variable that can take a numerical value

Quantitative

### Card 3

#### Front

A quantitative variable that can take any value within a range i.e time

#### Back ### Card 4

#### Front

A quantitative variable that can only take certain values i.e number of cars

#### Back ### Card 5

#### Front

Frequency of the class/Class width

#### Back 