Math 4th Q

• statistics - deals with collection, organization, presentation, analysis, and interpretation of data
• Descriptive statistics - presenting, organizing, summarizing data
• Inferential statistics - drawing conclusion about a population based on data observed in the sample
• Population - a complete collection of all elements to be studied
• Sample - a sub collection of elements drawn from a population
• data - facts and figures from which conclusion can be drawn
• Quantitative data - consist of numbers representing counts and measures
• Qualitative data - no numbers, it is opinion
• Discrete - exact count
• Continuous - rising count/infinite
• Random sampling - equal chance of being selected from the population
• Stratified sampling - dividing population into subgroups
• Systematic sampling - selected according to a random starting point (ex. every 3rd)
• Cluster sampling - dividing population into clusters
• Convenience sampling - choosing subjects who are conveniently available
• Methods of collecting data:

  • Surveys
  • observations
  • experiment
  • reading statistical publication
• Frequency - number of times appeared