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Chapter 4: Exploring Data (Measures of Position (Definition (to determine…
Chapter 4: Exploring Data
Dot Plots
Definition
groups the data as little as possible, while not losing the identity of an individual observation.
Stem-and-Leaf
Definition
Each numerical values are divided into two parts. The leading digit(s) becomes the stem of the trailing digit of the leaf.
Disadvantages
The exact identity pf each value is lost
Difficult to tell how the values within each class is distributed.
Measures of Position
Definition
to determine the location of values that divide a set of observations into equal parts
Deciles
Quartiles
Percentiles
Standard Formula
Box Plot
Definition
a graphical display, based on quartiles, that helps us picture a set of data.
Skewness
Formula
Formula
Relationship Between Two Variables
Scatter Diagram
Interval scale for both variables
Bivariate
The data of the relationships between two variables
Contingency Tables
Definition
to classify observations according to two identifiable characteristics
Example
Students at university are classified by gender and class rank