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  • STA 1510 -Basic Statistics (STA1510)
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STA1510 SUMMARY NOTES FOR CHAPTER 2 AND 3

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University Of South Africa (Unisa)
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STA 1510 -Basic Statistics (STA1510)
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I have created summary notes for chapter 2 and 3 which will help students to understand the module better. My summary notes contains useful information please make sure that you download so that you can pass the module.

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, STA1510 SUMMARY NOTES
STUDY UNIT 3


Central tendency


Measures of central tendency are the measures of location.
- They typical values that summarises the distribution.


Three types of measures of central tendency/measures of location
i. Arithmetic mean
ii. Median
iii. Mode


Arithmetic mean
- The sum of all the values in the data set divided by the number of observations (n).
∑𝑥
- It is symbolised by the population mean (𝜇) and it is given by
𝑛
Steps of how to calculate the mean

• Add all the given observations and find the total (∑ 𝑥)
• Count the number of observations (n)
• Divide the total numbers of observations (sum) by the number of observation
(n)

The median

- Is the centre of the distribution when data is arranged in ascending or descending
order.
- It divides the data set in two parts.

The mode

- Is the most frequent value in the data set.

How to calculate mean and standard deviation using a calculator
Connected book
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Unknown Business Statistics - A First Course
Publisher: 2021 ISBN: 9781323159286 Edition: Unknown

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Browse related subjects

Subjects

  • relative frequency
  • cumulative frequency
  • proportion
  • class interval
  • mean
  • median
  • standard deviation
  • variance
  • coefficient of variation
  • quartiles

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