Statistics_Ch 20 Flashcards
Statistics is concerned with scientific methods for collecting, organizing, analyzing, summarizing, and presenting data, as well as drawing valid conclusions and making reasonable decisions based on that analysis. The phase of stats that only seeks to analyze a given group without making conclusions or inferences about a larger group is known as ______ or ______ stats.
deductive / descriptive
Most distributions exhibit a central tendency. The three measures of this are ______, ______, and _______.
mean, median / mode
_______ is found by taking the total of all data values and dividing by the number of data values. This gives the average of the total of sample values.
Mean
What is the central tendency that represents the middle value of a numerically ordered data set and is used to moderate extreme values or data that can not be economically measures such as color.
Median
Mode represents the value that occurs most frequently in a data set. In what circumstance does no mode exist?
If all values are different.
T or F
Mode is used to show an irregular distribution of two peaks, for severely skewed distributions, or for describing the effects of extreme values.
F - All good except mode is used to eliminate the observed effects of extreme distribution.
Variation, spread, and scatter are aka _______.
dispersion
______ or ______ are the spread of data about the ______, and are the second most fundamental measure of statistical analysis.
Dispersion / variation / mean
The difference between the min and max dispersion values is _______, and is most effective when used with
range
While _____ is the simplest, _____ _____ is the most important measure of variation or dispersion.
range / std deviation
The coefficient of variation is std dev divided by the _____, with variance guaranteeing the existence of a difference btwn two items or obs the concept is that two will never be ______.
mean / identical
