Chapter 7: Investigating Data

Chapter 7: Investigating Data

1. Mean and mode

   • mean = sum of scores/ number of score
   • Mode=most frequent score

2. Organising and displaying data

   • Graphs
     • Column
     • Secto
   • Tables
   • Charts
     • Pie chart

3. Types of Data

   • Categorical
     • Groups in categories
   • Numerical
     • Numbers
     • Discrete
       • distinct values
     • Contiuous
       • not exact
         • decimal points

4. Median and range

   • median= middle score( in order)
   • range= highest score- lowest score

5. Analysing frequency tables

   • fx colum= score x frequency

6. Dot plots and Stem and leaf plots

   • Dot plots show cluster and outliers
   • Stem and lea plots show modes, clusters and how the scores are spread out

7. Frequency histograms and ploygons

8. Sampling

   • Sample
     • selection of people
   • Census
     • whole population
   • random sample
     • NOT biased
       • =not opiniated questions

9. Designing survey questions

   • simple
   • not biased
   • easy to answer
   • not too long

10. Analysing data

    • Mean
      • affected by outliers
      • *best when no outliers
    • Mode
      • not affected by outliers
      • *best when most common score is needed
    • Median
      • not affected by outliers
      • *when data has outliers
    • Range
      • *when a measure of spread is needed

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