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13 Cards in this Set
- Front
- Back
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descriptive statistics
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consists of methods of organization and summarizing information
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whats a population in regards to statistics?
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is the collection of all individuals or items under consideration in a statistical study
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what is a sample in regards to statistics?
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is the part of the population in which the information is obtained
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what is inferential statistics?
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consists of methods for drawing and measureing the reliablility of conclusions about a population based on information obtained from a sample of the population
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whats the difference in descriptive vs inferential statistics?
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If the intent of the study is to examine and explore the information obtained for its own intrinsic interest only, the study is descriptive.
If the information is obtained from a sample of a population and the intent of the study is to use that information to draw conclusions about the population, the study is inferential. |
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whats a census?
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is obtaining information on the entire population in interest
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whats an experimentation?
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is conducting a controlled study to come to conclusions about a topic
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whats sampling?
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is a method of acquiring information by choosing portion of a population in a particular way to make inference
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whats a representative sample?
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reflects as closely as possible the relevant characteristic of population under consideration
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whats probability sampling?
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a random device such as tossing a coin or consulting a table of random numbers, is used to decide which members of the population will constitute the sample instead of leaving such decisions to human judgement
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why is probablilty sampling a critical technique of statistics?
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the use of probability sampling eliminates unintentional selection bias and guarantees that the techniques of inferential statistics can be applied.
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what is simple random sampling ?
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is a sampling procedure for which each possible sample of a given size is equally likely to be the one obtained.
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what should you assume about simple random sampling?
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it is done without replacement
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