Chapter 7: Investigating Data

Mean and mode
1. mean = sum of scores/ number of score
2. Mode=most frequent score
Organising and displaying data
1. Graphs
  1. Column
  2. Secto
2. Tables
3. Charts
  1. Pie chart
Types of Data
1. Categorical
  1. Groups in categories
2. Numerical
  1. Numbers
  2. Discrete
    1. distinct values
  3. Contiuous
    1. not exact
      1. decimal points
Median and range
1. median= middle score( in order)
2. range= highest score- lowest score
Analysing frequency tables
1. fx colum= score x frequency
Dot plots and Stem and leaf plots
1. Dot plots show cluster and outliers
2. Stem and lea plots show modes, clusters and how the scores are spread out
Frequency histograms and ploygons
Sampling
1. Sample
  1. selection of people
2. Census
  1. whole population
3. random sample
  1. NOT biased
    1. =not opiniated questions
Designing survey questions
1. simple
2. not biased
3. easy to answer
4. not too long
Analysing data
1. Mean
  1. affected by outliers
  2. *best when no outliers
2. Mode
  1. not affected by outliers
  2. *best when most common score is needed
3. Median
  1. not affected by outliers
  2. *when data has outliers
4. Range
  1. *when a measure of spread is needed

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