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STA1510 SUMMARY NOTES FOR CHAPTER 2 AND 3 R125,00   Add to cart
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  3. University Of South Africa (Unisa)
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  5. STA 1510 -Basic Statistics (STA1510)

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STA1510 SUMMARY NOTES FOR CHAPTER 2 AND 3
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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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  • August 2, 2022
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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

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