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Statistics Chapter 2 Review

Terms in this set (22)

Bar Graph
a graph with bars that are of uniform width and are evenly spaced with gaps between the bars
A graph used to analyze categorical data...
qualitative data
Histogram
a graph with bars that represent a range of values on the horizontal axis and no gaps between the bars
Shows frequencies of data values in intervals of the same size...quantitative data
Frequency Histogram
a histogram that shows the ratio between class frequency and the total of all frequencies or the ratio can be expressed as a percent --- f/n
Circle Graph (Pie Chart)
shows the total quantity divided into component parts using proportional segments of a circle...qualitative
Time Plot
A graph showing the data measurements in order over a length of time. (horizontal axis is time)
Pareto Chart
A bar graph where bars are ordered according to height
Frequency is plotted from the most frequent to the least frequent...qualitative
Pictograph
A graph where pictures are used rather than solid bars.
Stem-and-leaf display
A device used to organize and group data that allows us to recover the data quickly. Similar to alphabetizing...quantitative
Dotplots
can be used with categorical or quantitative variables
a simple graph used to show the location of all the data value
graphs a dot for each case on a single axis
Quantitative Data
Numerical data such as the number of hours it takes to drive to different locations.
Qualitative data
Non-numerical data such as the color of a person's eyes.
Exploratory Data Analysis (EDA)
A field of statistics that uses stem-and-leaf displays, box and whisker plots, histograms, etc, to detect extreme patterns and data values quickly.
Outlier
A value much greater or much less than the others in a data set
Frequency table
A table that lists the number of times, or frequency, that each data value occurs.
Class boundaries
are the numbers used to separate classes, but without the gaps created by class limits.
Shape of distribution
describes how data is distributed.
normal, uniform, skewed right (positive), skewed left (negative) , bimodal
skewed
a distribution with its peak well to one side.
A unimodal asymmetric, distribution that tends to slant-most of the data are clustered on one side of the distribution and "tails" off on the other side.
relative frequency histogram
Same as regular frequency histogram except vertical scale measures relative frequencies instead of frequencies (% instead of #)
relative frequency
the number of times an event occurs, DIVIDED by the total number of trials
class limit
highest and lowest possible
midpoints
half way point within the class interval.
average of the upper and lower real limits of each class interval. diff between midpoint= class interval size
ogive
a line graph of a cumulative frequency or cumulative relative frequency distribution.
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