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Chapter 7: Investigating Data

- Mean and mode
- mean = sum of scores/
number of score
- Mode=most frequent score

- mean = sum of scores/
number of score
- Organising and displaying data
- Graphs
- Column
- Secto

- Column
- Tables
- Charts
- Pie chart

- Pie chart

- Graphs
- Types of Data
- Categorical
- Groups in categories

- Groups in categories
- Numerical
- Numbers
- Discrete
- distinct values

- distinct values
- Contiuous
- not exact
- decimal points

- decimal points

- not exact

- Numbers

- Categorical
- Median and range
- median= middle
score( in order)
- range= highest
score- lowest score

- median= middle
score( in order)
- Analysing frequency tables
- fx colum= score x frequency

- fx colum= score x frequency
- 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

- Dot plots show cluster and outliers
- Frequency histograms and ploygons
- Sampling
- Sample
- selection of people

- selection of people
- Census
- whole population

- whole population
- random sample
- NOT biased
- =not opiniated questions

- =not opiniated questions

- NOT biased

- Sample
- Designing survey questions
- simple
- not biased
- easy to answer
- not too long

- simple
- Analysing data
- Mean
- affected by outliers
- *best when no outliers

- affected by outliers
- Mode
- not affected by outliers
- *best when most
common score is needed

- not affected by outliers
- Median
- not affected by outliers
- *when data has outliers

- not affected by outliers
- Range
- *when a measure of
spread is needed

- *when a measure of
spread is needed

- Mean

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