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Here we are providing some common terms and definitions used in statistics. Select the area you want to find terms and meanings in.
DATA Term Explanation data
(i) discrete
(ii) continuousInformation that is collected
data which are usually whole numbers(eg number of family members)
data that can take on any decimal value(eg height of student)(i) census
(ii) sample
Two types of Information Collection
survey of the whole population(eg population of Australia, or the population of your family
survey of a small proportion of the whole population, chosen randomly(sample of 100 fish from the bay)
sample size should be big enough not to be biased
bias the sample should be chosen so that each member of the population is equally likely to be chosen ie. so that there is no bias random sampling selection of data so that no bias is introduced into the survey score the tally of each value or number in the survey USE OF DATA Term Explanation range difference between the highest and lowest values in the sample mean
can be called average
median middle score for an odd number of values
or
average of the middle two values for an even number of valuesmode value that occurs the most Data may be grouped Results or values grouped into classes mean
is calculated approximately using the class centresmedian class is the class containing the middles score or scores modal class is the class with the highest frequency DISPLAY OF DATA Term Explanation frequency histogram a column graph
the vertical axis shows the frequenciescumulative frequency histogram
or
ogivea line graph
the vertical axis shows the cumulative frequencies
upper quartile(75% line for number of values)
median(50% line for the number of values)
lower quartile(25% line for the number of values)
fivenumber summary lowest value
lower quartile
median
upper quartile
highest valuebox plot pictorial representation of fivenumber summary



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