Flashcards
Satistics - käsitteet
Flashcards do conjunto (17)
- 1PopulationThe complete set of all items that interest an investigator.
- 2SampleAn observed subset or portion of a population with sample size given by n.
- 3Random samplingEach member of the population in chosen strictly by chance, each member of the population is equally likely to be chosen.
- 4Systematic samplingSelection of every 'j' th item in the population, where j is the ratio of population size N to the desired sample size n.
j=N/n. - 5ParameterNumerical measure that describes a specific characteristic of a population.
(The shares of smokers in Sweden) - 6Statisticnumerical measure that describes a specific characteristic of a sample.
(The share of smokers in 100 chosen people living in Sweden) - 7Sampling errorResults from the fact that information is available on only a subset of all the population members.
- 8Non-sampling errorErrors unconnected with the kind of sampling procedure used.
1. The population actually sampled is not the relevant one.
2. Survey subjects may give inaccurate or dishonest answers.
3. There may not be response to survey questions. - 9Descriptive statisticsFocus on graphical and numerical procedures that are used to summarize and process data.
- 10Inferential statisticsFocus on using the data to make predictions, forecasts and to estimate to make better decisions.
- 11Variablea specific characteristic, such as age or weight, of an individual or object.
- 12Categorical variablesproduce responses that belong to groups and categories.
Responses to yes/no questions. - 13Numerical variablesHave values that describe a measurable quantity as a number, like "how many" & "how much".
- 14Qualitative dataThere is no measurable meaning to the difference in numbers.
Basketball players' numbers. - 15Quantitative dataThere is measurable meaning to the difference in numbers.
Points from an exam. - 16Nominal dataResponses to questions on gender, country of citizenship, political affiliation.
Lowest or weakest type of data. - 17Ordinal dataIndicates the rank ordering of items. product quality rating, satisfaction rating.
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- Statistics FlashCards sobre Satistics - käsitteet, criado por K K em 19-01-2017.
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- K K
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