Question 6
A manufacturer of moisturizing lotions wants to do a sample survey about the brand standing of its brand. It plans to do a house-to-house multistage cluster sampling survey. The company classifies its customers based on skin type (dry / oily) and age (Young / Middle-aged / Elder) and customizes its designs accordingly. The company wants to do the study in only one city. The company wants have a robust sample size with no compromises. What should be the sample size?