Statistics A Level
Home > Flashcards > Print Preview
The flashcards below were created by user
yotomoco
on
FreezingBlue Flashcards. What would you like to do?

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 nonnumerical observations

Equation to find the median of a set of data
 n
 2
 if = whole number find the midpoint 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