Probability of obtaining a specific number of success out of a given number trials
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Bivariate Data
Data sets with two variables
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Causiality
The relationship between an event and a second event.
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Choropleth Map
Map or diagram where different areas have different shadings to represent different distributions
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Class width
The difference between the upper and the lower values of a group.
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Comparative pie chart
Two or more pie charts used to compare sets of data.The total area of each pie chart is in proportion the the equal frequency.
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Correlation
The measure of relationship between two variables.
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Cumulative frequency
frequency found by adding each frequency to all the preceding frequency.(A running total)
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Double mean point
A coordinate in a scatter graph where the x coordinate is the mean of all your x value and the y coordinate is the mean of all your y values.
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Extrapolation
Obtaining a prediction/estimate from out side your given data.
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Frequency
How often something occur.
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Frequency density
Frequency divided by class width.
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Independent Events
The outcome of the first event is not affect by the outcome of the second one.
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Index number
Percentage in relation to a base value. Given by the formula: (Value /base value)
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Interpolation
Estimating from within the data.
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Interquartile range (IQR)
Differance between the upper and the lower quartile
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Mean
Sum of all the numbers/data divided by how many of them are there.
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Median
The middle number when the data is arranged in numerical order.
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Mode
The most common number.
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Negative skew
When the mean is greater than the median but less than the mode.
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Normal distrubution
Distribution represented by a symmetrical curve.99.7% of the data falls within 3 standard deviations of the mean.
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Outlier
An anomaly. More than 1.5 times the IQR above or below the upper or lower quartiles.
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Probability
the likelihood of an event occurring.
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Range
The difference between the highest and the lowest value.
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Sample frame
A list or register where you choose you sample from.
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Sample method
The method you use to select a sample
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Seasonal variation.
Variation of data according to the time of year.
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Standard diviation
A measure of how close pieces of data are to the mean.The average distance a piece of data is away from the mean. The higher the standard deviation the more spread out the data is.
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Trend line
A line of best fit to represent how data has changes over a period of time.
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Variance
Standard deviation squared.
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Weighted mean
A mean where each piece of data has been multiplied by the weighting to reflect its relative importance.
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