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Statistics GAT Review
Terms in this set (37)
Any one of several measures designed to reveal the central tendency of a collection of data
Data that can be sorted into different categories distinguished by a nonnumeric characteristic
Data resulting from infinitely many possible values that can be associated with points on a continuous scale in such a way that there are no gaps or interruptions
Methods used to summarize the key characteristics of known population data
Minimum score, maximum score, median, lower quartile, upper quartile
Difference between the third and first quartiles
Median of the lower half of all scores (from the minimum score up to and including the original median); used in a boxplot
Sum of a set of scores divided by the number of scores
Middle value of a set of scores arranged in order of magnitude (value).
Score that occurs most frequently
Complete and entire collection of elements to be studied
The three values that divide ranked data in four groups, with approximately 25% of the scores in each group
Sample selected in such a way that every member of the population has the same chance of being chosen
Measure of dispersion that is the difference between the highest and lowest scores.
Subset of a population
Median of the upper half of all scores (from the original median up to the maximum score); used in a boxplot
Many sets of data have a bell shape. We often describe data sets in terms of how they vary from this bell shape.
Two peaks (of approximately) the same height.
Refers to the way the data is spread out on the number line.
Intervals where there are no data between the low and high.
A value that is far from the rest of the data
Refers to how much the data is spread out on the number line
Test For Outliers
-1.5 times the interquartile range + third quartile
-First quartile - 1.5 times the interquartile range
Q1 = 5
Q3 = 8
IQR = 3
1.5 times 3 = 4.5
4.5 + 8 = 12.5
5 - 4.5 = 0.5
Any data point less than 0.5 or greater than 12.5
is an outlier. In this set, 15 is an outlier.
Possible data values are listed on the x axis. An X goes for every element of the corresponding value.
Possible data values are listed on the x axis. A dot goes for every element of the corresponding value.
A bar graph shows the frequency of specific data values in a data set.
Circle Graph(or pie chart)
A circle divided into parts. Each section represents the percentage of the data elements.
Stem Plot(stem and leaf plot)
Plot that seperates data by 10's. Stems represent each 10 value and the leaves are the 1 value.
a diagram consisting of rectangles whose area is proportional to the frequency of a variable and whose width is equal to the class interval.
Box Plot ( box and whiskers plot)
Constructed by marking the 5 point summary
Continuous(usually) graph that shows change overtime.
a graph in which the values of two variables are plotted along two axes, the pattern of the resulting points revealing any correlation present.
How to find Standard Deviation
What percentage of data is found within the first standard deviation?
What percentage of data is found within the second standard deviations?
What percentage of data is found within the third standard deviations?
What percentage of data is found within the fourth standard deviations?
THIS SET IS OFTEN IN FOLDERS WITH...
Cones and Cylinders
GAT Final Q3
GAT Final Q4
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