EDA CH1 T3 Flashcards
Data recorded in the sequence in which they are collected and before they are processed or ranked are called
raw data
lists all categories and the number of elements that belong to each of the categories.
frequency distribution of a qualitative variable
A graph made of bars whose heights represent the frequencies of respective categories is called a
bar graph
A circle divided into portions that represent the relative frequencies or percentages of a population or a sample belonging to different categories is called a
pie chart
lists all the classes and the number of values that belong to each class.
frequency distribution for quantitative data
Data presented in the form of a frequency distribution are called
grouped data
is given by the midpoint of the upper limit of one class and the lower limit of the next class
class boundary
is a graph in which classes are marked on the horizontal axis and the frequencies, relative frequencies, or percentages are marked on the vertical axis.
histogram
A graph formed by joining the midpoints of the tops of successive bars in a histogram with straight lines is called a
polygon.
distribution gives the total number of values that fall below the upper boundary of each class.
cumulative frequency
is a curve drawn for the cumulative frequency distribution by joining with straight lines the dots marked above the upper boundaries of classes at heights equal to the cumulative frequencies of respective classes.
ogive
of quantitative data, each value is divided into two portions – a stem and a leaf. The leaves for each stem are shown separately in a display.
stem-and-leaf display
Values that are very small or very large relative to the majority of the values in a data set are called
outliers or extreme values
