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31 Cards in this Set
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 Back
Frequency Distribution

A summary of a set of data that displays the number of observations in each of the distributions distinct categories or classes


Discrete Data

Data Whose possible values are countable


Relative Frequency

the proportion of total observations that are in a given category. Realitive frequency is computed by dividing the frequency in a category by the total number of observations


Continous Data

data whose possible values are uncountables and which may asume any value in an interval


Data Array

data that have been sorted in ascending or descending order


Mutually exclusive classes

classes that do not overlap so that a data value can be placed in only one class


All exclusive classes

a set of classes that contains all the possible data values


Equal Width Classes

the distance between the lowest possible value and the highest possible value in each class is equal for all classes


Class Width

the distance between the lowest possible value and the highest possible value for a frequency class


Minimum Class Width Equation

largest value  smallest value / # of classes


Class Boundaries

the upper and lower values of each class


Cumulative Freqeuncy Distribution

a summary of a set of data that displays the number of observations with values less than or equal to the upper limit of each of its classes


Cumalitive Relative Frequency Distribution

a summary of a set of data that displays the proportion of observations with values less than or equal to the upper limit of each of its classes


Frequency Histogram

a graph of a frequency distribution with the horizontal axis showing the classes, the vertical axis showing the frequency count. and 9 for equal class widths) the rectangles having a height equal to the frequency in each class


dependent variable

a variable whose values are thought to be a function of or dependent on the values of another variable called the independent variable


independet variable

variables whose values are thought to impact the dependent variable. it is grapehed on the x axis


business statistics

a collection of tools and techniques that are used to convert data into meanigful information


statistical infrence tools

tools that allow a decsion maker to reach a conclusion about a population of data based on a subset of data from the population


experimental design

a plan for performing an experiment in which the variable of intrest is defined.


demographic questions

questions relating to the respondents own chracteristics backgrounds and attributes


census

an enumeration of the entire set of measurments taken from a whole population


nonstatistical sampling techniqes

those methods of selecting samples using convience judgement or other nonchance processes


statistical sampling teechniques

those sampling methods that use selection techniques based on chance selection


Convience Sampling

s ampling techinique that selects the items from the population based on accessiblity and ease of selection


stratified random sampling

a statistical method in which the population is divided into subgroups called strata so that each population item belongs to only one stratum


Systematic Random Sampling

a statistical random sampling technique that involves the selecting every kth item in the poulation after a randomly selected starting point between 1 and k. the value of k is determined as the ratio of the population size over the desired sample size


cluster sampling

a method by which the population is divided into groups or clusters that are each intended to be mini populations.


quantitative data

measurements whose values are inherently numerical


qualitative data

data whose measurement scale is inherently catergorical


Time series data

a set of ordered data whose values observed at succesive points in time


cross sectional data

a set of data values observed at a fixed point in time
