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Statistics A Level
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What is continuous data?
Data that can take any value in a given range
What is discrete data?
Data that can take only specific values in a given range
What is quantitative data?
Data associated with numerical observations
What is qualitative data?
Data associated with non-numerical observations
Equation to find the median of a set of data
n
2
if = whole number find the mid-point of the corresponding term and the term above
if ≠ whole number round the number up and pick the corresponding term
Equation to find the mean of a set of data
x = data
n = number of observations
Equation to find the mean of data in a table
f = frequency
x = data or midpoint when grouped data
Equation for Q
_{1}
n = number of observations
Equation for Q
_{3}
n = number of observations
Equation for interquartile range
Equation to find the
^{th }
percentile, P
x = percentile
n = number of observations
Equation for interpercentile range
P = percentile
m/n = number of the percentile
Equation for variance (using x_bar)
x = data or midpoint when grouped data
x_bar = mean
n = number of observations
Equation for variance (using x and n only)
x = data or midpoint when grouped data
n = number of observations
Equation for standard deviation
Equation for lower bounds (outlier test)
Q
_{1 }
= lower quartile
IQR = interquartile range
Equation for upper bounds (outlier test)
Q
_{3 }
= upper quartile
IQR = interquartile range
Equation for frequency density
f = frequency
class width = difference between the lowest bound in the class and the highest
what type of distribution is this?
Symmetrical
What type of distribution is this?
positively skewed
What type of distribution is this?
negatively skewed
What type of distribution is this?
negatively skewed
What type of distribution is this?
positively skewed
What type of distribution is this?
symmetrical
Equation to work out how skewed the data is
x_bar = mean
SD = standard deviation
the larger the number the larger the skew
the closer the number to zero the more symmetrical the data
a negative number means a negative skew
a positive number means a positive skew
Define: experiment
a repeatable process that gives rise to a number of outcomes
Define: event
a collection (or set) of one or more outcomes
Define: sample space
the set of all possible outcomes of an experiment
On a Venn diagram:
A ∩ B
the overlap between event A and B
On a Venn diagram:
A ∪ B
the area contained within both A and B including the overlap
On a Venn diagram:
A '
Everywhere on the venn diagram apart from anywhere inside A
Author:
yotomoco
ID:
249225
Card Set:
Statistics A Level
Updated:
2013-11-26 22:17:11
Tags:
Statistics Level
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Description:
srtyjk
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