Charts and Graphs Flashcards
Graphics:
Good - help the reader to:
Bad - hinder the reader from:
Understand the data
Understanding/give a distorted reading of the data
Histogram:
frequency of responses along vertical axis, must start from:
zero
Histogram:
Grouping data - recorded into intervals of
equal width
Histogram:
Values of the variable on the
horizontal axis
Histogram:
Each bar represents an interval - missing data are
excluded
Histogram:
Bars touch each other because it represents:
continuous variable
Histogram:
Bars touch each other except when their is a
gap in the data
Histogram:
Bars must be
equal widths
RULES FOR RECORDING DATA CONTINUOUS DATA INTO GROUPS:
Intervals/categories must be:
- Mutually exclusive
- Exhaustive
RULES FOR RECORDING DATA CONTINUOUS DATA INTO GROUPS:
Mutually exclusive means:
no case belongs to more than one interval
RULES FOR RECORDING DATA CONTINUOUS DATA INTO GROUPS:
Exhaustive means:
Categories cover all the values of the variable in the data set
Histogram:
The choice of which intervals to use is
arbitrary [subjective]
