Chapter 2 Flashcards
Define: raw data
Data in the order that it was collected - before analysis or processed
Define: frequency distribution of qualitative variable
Lists all categories and all subjects in categories
Equation: relative frequency distribution
All tested individuals divided by sum of all frequencies
Define: frequency distribution of quantitative variable
Lists all classes and all values in classes
Define: group data
Data represented in a frequency distribution
Define: class boundary
Midpoint of upper/lower limits of two other classes.
Equation: class width
Upper boundary - lower boundary
????
(Highest value - lowest value)/number of classes
Equation: class midpoint/mark
(Lower limit + upper limit)/2
Bar graph bars represent:
Frequencies of categories
Sections of a pie chart represent:
Relative frequencies or percentages of categories
Define: cumulative frequency
Total number of values that fall below the upper boundary of each class
Equation: cumulative relative frequency
Cumulative frequency/total observations in the data set
Define: histogram
Classes on horizontal axis, frequencies/percentages on vertical axis
Define: polygon
Joining the tops of successive bars on a histogram
Define: frequency distribution curve
For a very large dataset, a frequency polygon becomes a smooth curve
