Chapter 1: Intro to Statistics

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Last updated 6:37 AM on 8/20/26
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5 Terms

1
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What is Statistics

[COSI]

  1. Collect data

  2. Organise data

  3. Summarise data

  4. Interpret data


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Types of Statistics

  1. Descriptive Statistics

  • collect, organise, summarise, present

  • charts, graphs, tables

  1. Inferential Statistics

  • use info from sample to make conclusion about a population

  • estimations, hypothesis, relationship among variables, making predictions


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Data sources

  1. Primary

  • by researcher

  • interviews, experiments, survey, questionnaires

  1. Secondary

  • collected/produced by others

  • publications, journals, newspapers


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Types of Variables

  1. Quantitative: numerical/can be ordered and ranked

  • Discrete : can be counted

  • Continuous : measure & decimal numbers


  1. Qualitative: non-numerical/ given by categories

  • genders /groups


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Types of Scales

[NOIR] : data stronger from the bottom up

  1. Nominal (Qualitative variable)

  • no order/rankings

  • can’t interpret much data

  1. Ordinal (Qualitative variable)

  • categories that can be ranked

  • educational level

  1. Interval (Quantitative Variable)

  • temperature/IQ/altitude

  1. Ratio (Quantitative variable)

  • anything other than the 3

  • can be weight/height/BMI