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Characteristics of Data

Characteristics of Data. Data ~ a body or series of information or facts Population ~ a group of individuals that is studied Sample ~ a selected sub-set of the population Inference ~ a conclusion about a population that is made from a sample. Key terms. Census ~ Study the whole population

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Characteristics of Data

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  1. Characteristics of Data Data ~ a body or series of information or facts Population ~ a group of individuals that is studied Sample ~ a selected sub-set of the population Inference ~ a conclusion about a population that is made from a sample Key terms

  2. Census ~ Study the whole population • Cross sectional study~ individuals from different groups at the same time • Longitudinal Study ~ Considers individuals over a long period of time • (examples to follow)

  3. Time series data~ data accumulated over a long period of time (e.g. the population of a city) • Quantitative variable ~ measured (e.g. height) • Qualitative Variable ~ descriptive (e.g. eye colour) • Discrete Data ~ Whole numbers (e.g. the number of children in a household) • Continuous Data ~ Real numbers (e.g. height)

  4. Longitudinal take 20 grade 9’s Track their work habits over 4 years Analyze the data and make inferences Cross-Sectional Take 5 students from each grade Track work habits over 1 semester Analyze data and make inferences Work habits of students What are the advantages and disadvantages of each?

  5. Homework • None, go to 3b

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