You cannot survey every customer, so you must use sampling. This section covers how to ensure your small group accurately represents the whole. Core Topics Random, stratified, and cluster sampling.
Memorize the conditions for using a Z-test vs. a T-test (Sample size > 30). ba4101 statistics for management notes pdf
Testing the independence of two categorical variables. You cannot survey every customer, so you must use sampling
The "Bell Curve" used for quality control and finance. You cannot survey every customer