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
statistic
8. census figures are based of population parameters
t
 Author: Cshowalter ID: 302662 Card Set: e280 chapter 1 1.1 1.2 Updated: 2015-05-13 14:58:05 Tags: e1 Folders: e1 Description: e1 Show Answers: