Unit 3 Flashcards
set of data in its original form
raw data
arrangement of observations according to their magnitude, either in increasing or decreasing order.
array
contains information on each member of a sample or population individually
ungrouped data
for quantitative data lists all the classes and the number of values that belong to each class
frequency distribution
Data presented in the form of a frequency distribution are called ____
grouped data
the number of observations falling in the class
class frequency
the numbers defining the class
class interval
the end numbers of the class
class limits
the true class limits
class boundaries
usually defined as halfway between the lower-class limit of the class and the upper-class limit of the preceding class
lower class boundary (LCB)
usually defined as halfway between the upper-class limit of the class and the lower-class limit of the next class
upper class boundary (UCB)
denoted by C, is the difference between the upper and lower class boundaries of a given class. It is also called the class width.
class size
midpoint of a class interval
class mark
a class that has no lower class limit or upper class limit (e.g., 92 and above)
open-end class
can be used as a first approximation of the number of classes
Sturge’s formula
