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7th Math, 4th Nine Weeks
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Terms in this set (20)
mean
The sum of the data divided by the number of items in the data set
measures of central tendency
Numbers that are used to describe the center of a set of data. These measures include the mean, median, and mode.
median
The middle number in a set of data when the data are arranged in numerical order. If the data has an even number, the median is the mean of the two middle numbers.
mode
The number or numbers that appear most often in a set of data
outliers
A piece of data that is quite separated from the rest of the data. In a box-and-whisker plot, data that are more than 1.5 times the interquartile range from the quartiles.
range
The difference between the greatest and the least numbers in a set of data
box-and-whisker plot
A diagram that summarizes data using the median, upper and lower quartiles, and the extreme values. A box is drawn around the quartile values, and whiskers extend from each quartile to the extreme data points.
cumulative frequency
Includes a running total of the frequencies of all the previous groups
frequency distribution
Shows how often an item, a number, or a range of numbers occurs
histogram
A special kind of bar graph in which the bars are used to represent the frequency of numerical data that have been organized in intervals
line plot
A graph that uses an x above a number on a number line each time that number occurs in a set of data
quartile
Values that divide a set of data into four equal parts
scattergram (scatter plot)
Two sets of related data are plotted as ordered pairs on the same graph
stem-and-leaf plot
A system used to condense a set of data where the greatest place value of the data forms the stem and the next greatest place value forms the leaves
positive relationship
As the value of x increases the value of y increases
negative relationship
As the value of x increases the value of y decreases
no relationship
The value of x is independent of the value of y
interquartile range
The difference between the upper quartile and the lower quartile
conjectures
A prediction that suggests what can be expected to happen
predictions
A statement made about future occurrences
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