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Unit 4 Vocab
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Terms in this set (26)
population
the entire collection of items that is the focus of concern
sample
a subset that is representative of the population
sample size
the number of people used for a particular survey
survey
a study of one or more characteristics of a group
random sample
a sample in which everyone in the population has an equal chance of selection
sample bias
a sample that is not representative of the population
question bias
a question that encourages a particular response. a biased question is a question worded in such a way that a particular answer is favored over others
data
information, especially numerical information; usually organized for analysis
prediction
to state in advance on the basis of observation, experience, or scientific reason
statistics
the science of collecting, organizing, representing, and interpreting data
box-and-whisker-plot
a diagram based on the five-number summary of a data set
frequency table
a table that lists items and uses tally marks to record and show the number of times they occur
histogram
a graphical representation of the distribution of data
inter-quartile-range (IQR)
the difference between the upper quartile (Q3) and lower quartile (Q1). it represents the middle 50% of the data
maximum value
the number of greatest value in a set of data
mean absolute deviation (MAD)
a measure of statistical dispersion or variability using absolute values from the mean
mean
the average of a set of data. the sum of the numbers divided by the number of numbers
measures of center
mean, median, and mode
measures of spread
range, IQR, and MAD
median
the number which is in the middle of a set of data after the numbers are arranged in order from least to greatest
minimum value
the number of least value in a set of data
mode
the number which occurs the most frequently in a set of data
mutually exclusive
two events are "mutually exclusive" if they cannot occur at the same time
outlier
a number which is much greater or much less than others in a set of data
range
the difference between the largest and smallest of the numbers in a set of data
stem-and-leaf plot
a special table where each data value is split into a "leaf" (usually the last digit) and a "stem" (the other digits)
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