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31 Cards in this Set
- Front
- Back
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Frequency Distribution
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A summary of a set of data that displays the number of observations in each of the distributions distinct categories or classes
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Discrete Data
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Data Whose possible values are countable
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Relative Frequency
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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
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Continous Data
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data whose possible values are uncountables and which may asume any value in an interval
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Data Array
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data that have been sorted in ascending or descending order
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Mutually exclusive classes
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classes that do not overlap so that a data value can be placed in only one class
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All exclusive classes
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a set of classes that contains all the possible data values
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Equal Width Classes
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the distance between the lowest possible value and the highest possible value in each class is equal for all classes
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Class Width
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the distance between the lowest possible value and the highest possible value for a frequency class
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Minimum Class Width Equation
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largest value - smallest value / # of classes
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Class Boundaries
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the upper and lower values of each class
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Cumulative Freqeuncy Distribution
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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
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Cumalitive Relative Frequency Distribution
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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
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Frequency Histogram
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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
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dependent variable
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a variable whose values are thought to be a function of or dependent on the values of another variable called the independent variable
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independet variable
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variables whose values are thought to impact the dependent variable. it is grapehed on the x axis
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business statistics
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a collection of tools and techniques that are used to convert data into meanigful information
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statistical infrence tools
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tools that allow a decsion maker to reach a conclusion about a population of data based on a subset of data from the population
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experimental design
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a plan for performing an experiment in which the variable of intrest is defined.
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demographic questions
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questions relating to the respondents own chracteristics backgrounds and attributes
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census
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an enumeration of the entire set of measurments taken from a whole population
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nonstatistical sampling techniqes
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those methods of selecting samples using convience judgement or other nonchance processes
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statistical sampling teechniques
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those sampling methods that use selection techniques based on chance selection
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Convience Sampling
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s ampling techinique that selects the items from the population based on accessiblity and ease of selection
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stratified random sampling
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a statistical method in which the population is divided into subgroups called strata so that each population item belongs to only one stratum
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Systematic Random Sampling
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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
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cluster sampling
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a method by which the population is divided into groups or clusters that are each intended to be mini populations.
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quantitative data
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measurements whose values are inherently numerical
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qualitative data
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data whose measurement scale is inherently catergorical
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Time series data
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a set of ordered data whose values observed at succesive points in time
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cross sectional data
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a set of data values observed at a fixed point in time
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