Flashcards in Unit 4 Vocabulary Deck (21):
A diagram that summarizes data using the median, the upper and lower quantities, and the extreme values (minimum and maximum). Box and whisker plots are also known as box plots. It is constructed from the five-number summary of the data: minimum, Q1 (lower quartile), Q2 (median), Q3 (upper quartile), maximum.
Box and whisker plot
An official count or survey of an entire population, typically recording various details of individuals.
Pieces of information, numbers, and facts, from a survey.
The number of times an item, number, or event occurs in data.
The organization of raw data in table form with classes and frequencies.
Grouped frequency table
A way of displaying numeric data using horizontal or vertical bars so that the hint or length of the bars indicates frequency.
It is a measure of variation in a set of numerical data, the interquartile range is the distance between the first and third quartile so of the data set. (Sometimes called upper and lower quartiles)
Inter-quartile range (IQR)
The largest value in a set of data.
A measure of center in a set of numerical data, computed by adding all the values in a list and then dividing the number of values in the list.
The average distance of each data value from the mean (x). The MAD is a grease of “on average” how different the data values are from the mean value. MAD = total distance from the mean for all values/number of data values.
Mean absolute deviation (MAD)
The mean and the median are both ways to measure the center of data.
Measures of center
The range and the mean absolute deviation are both common ways to measure the spread of a set of data.
Measures of spread
A measure of center in a set of numerical data. The median of a list of values is the values appearing at the center of a sorted version of the list- or the mean of the two central, values if the list contains an even number of values.
The smallest value in a set of data
The number that occurs the most often in a list. There can me more than one mode, or no mode.
A value that is very far away from most of the values in a data set.
A measure of spread for a set of data. To find the range, subtract the smallest value from the largest value in a set of data.
A part of the population that we actually examine in order to gather information.
Consists of individuals from the population chosen in such a way that every set of individuals has an equal chance to be part of the sample actually selected. Poor sampling meat holds, that are not random and do not represent the population well, can lead to misleading conclusions.
Simple random sampling
A graphical method used to represent ordered numerical data. Once the data are ordered, the stem and leaves are determined. Typically the stem is all but the last digit of each data pion and the leaf is the last digit.
Stem and leaf plot