Study Figure 1.
Figure 1
A student was investigating the perceived economic impacts of an urban regeneration scheme in a newly redeveloped district. They used a stratified sampling technique to select 10 businesses from each of the three functional zones (Zone A: Retail, Zone B: Residential, and Zone C: Industrial) as shown in Figure 1, to conduct a structured questionnaire.
Explain one advantage and one disadvantage of the sampling technique shown in Figure 1.
