e280 chapter 1 1.1 1.2

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  1. descriptive statics
    refers to the summary of important aspects of a data set. this includes collecting data, organizing the data , and then presenting the data in the forms of charts or tables
  2. inferential statistics
    refers to drawing conclusions about a large set of data called a population  based on a smaller set of sample data. a population is defined as all members of a specified group (not necessarily ppl) whereas a sample is a subset of that particular population
  3. types of data ( 2 types)
    • Cross sectional data- refers to data collected by recording a characteristic of many subjects at the same point in time, or without regard to differences in time.
    • Time series data- refers to data collected by recording a characteristic of a subject over several time periods. Time series can include daily, monthly, quarterly, or annual observations.
  4. Population
    consists of all items of interest in a statical problem
  5. Sample
    is a subset of the population.

    • example, the population of letters
    • in the alphabet would be the collection of all 26 letters.  Randomly selecting a subset of letters would
    • create a sample
  6. Parameter
    the certain aspect of a population (such as the average age or the percentage who said yes to a question), that measurement is called
  7. If any aspect of a sample is described by a measure, it is called
  8. census figures are based of population parameters
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e280 chapter 1 1.1 1.2
2015-05-13 14:58:05
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