Assignment 2 Flashcards
Central tendancy
A central tendency/measure of central tendency is a central or typical value for a probability distribution. Colloquially, measures of central tendency are often called averages.
Frequency histogram
A frequency graph composed of vertical or horizontal rectangles that touch each other.
Bin width
The width of an interval that is used in constructing a frequency table or histogram.
Letter value display
A method of displaying simple statistical parameters including hinges, the statistical median, and upper and lower values as symbols.
Grouped data
Frequency data that are displayed in bins or intervals.
Variability/Spread
The degree to which numbers differ from central tendency.
Standard deviation
A measure of variability in which squared deviations from the mean are averaged.
Trimmed mean
An average in which a certain portion of numbers are deleted from the highest and lowest ends of an ordered batch of data.
Location
Another name for average.
Polygon
A type of frequency graph that is constructed by connecting dots by a single line. The resulting figure is a multi-sided figure.
Arithmetic mean
An average in which the numbers are added and divided by the number of numbers.
Harmonic mean
A type of average that is calculated by way of the reciprocals of numbers. Specifically, the harmonic mean is defined as the reciprocal of the arithmetic mean of the reciprocals of a specified set of numbers.
Quadratic mean/RMS
An average that is computed primarily for positive and negative numbers in which zero is a reference point.
Tukey trimean
A weighted average that uses the median and hinges.
Weighted arithmetic mean
An arithmetic mean in which all the numbers are weighted differentially. (Think calculating a GPA)
