Exploration and description /Estimation

Scenario 1

First we can calculate (mean) and s²_i (variance) for each dip-tank area.

This may be accomplished, for example for Lobamba Sub-region for cattle, by using the Pivot Table feature of Microsoft Excel for the variable cat_no in CS12Data1 (Data Pivot → Table and Pivot Chart Report...) as shown in `Descr_Stats' worksheet of CS12Data1 and illustrated below.

Notice the ranges in numbers of cattle recorded per homestead. There is some evidence of skewness in the numbers of cattle (cat_no).