Statistical Techniques - Formula Sheet
Formula sheet
| Measure | Formula |
|---|---|
| Range | Highest value - lowest value |
| Midpoint | (lower limit + upper limit)/2 |
| Class interval | Upper limit - lower limit |
| Mean (individual) | \( \bar{X} = \Sigma X / N \) |
| Mean (grouped) | \( \bar{X} = A + \frac{\Sigma fd}{N} \times i \), \( d = (x - A)/i \) |
| Median (individual) | Value of the \( \left(\frac{N+1}{2}\right) \)th item |
| Median (grouped) | \( l + \frac{N/2 - m}{f} \times c \) |
| Mode (grouped) | \( l + \frac{f_1 - f_0}{2f_1 - f_0 - f_2} \times c \) |
Key terms
- Four processes: collection, presentation, analysis, interpretation.
- Primary methods: direct personal investigation, indirect oral investigation, questionnaire.
- Secondary sources: published, unpublished.
- Tally marks: groups of 5, cross stroke for the 5th.
- Types of averages: mean, median, mode.
Worked answers from the lesson
- Cuddalore mean temperature: 28.42
- Plant heights mean: 35
- Chennai minimum temperature median: 25.1
- Literates by age median: 20.15
- Daily wages mode: 55
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