15.7.2.2. Standard Deviation and Coefficient of Variation

Try these first

1. 1.

   Define standard deviation in your own words.

   Hint

   Think about consistency and variation.

2. 2.

   What does a high standard deviation indicate?

   Hint

   Consider how rainfall might vary.

3. 3.

   What does standard deviation measure?

   • The average value
   • The variability of data
   • The total sum of data

   Hint

   It’s related to how 'spread out' your data is.

4. 4.

   True or False: A lower coefficient of variation indicates less relative variability.

   • True
   • False

   Hint

   Consider what 'relative variability' implies.

5. 5.

   Given the following monthly rainfall data for a region: Jan: 80 mm, Feb: 90 mm, Mar: 150 mm, Apr: 120 mm, May: 60 mm, June: 200 mm, calculate the standard deviation and CV.

   Hint

   Calculate the mean first to find standard deviation.

6. 6.

   Analyze how the difference in CV between two regions (Region A: CV 15%, Region B: CV 30%) impacts agricultural strategies.

   Hint

   Think about how farmers would react to rainfall forecasts.