why do companies do not do surveys can you use weighted sample data on a customer survey when to use reweighting why do we use random sampling and allocation how do you know how many strata you belong to why do we do customer surveys what is the sampling strategy in customer surveys how does customer survey work can you do a second customer survey why should we do customer surveys how many strata in the customer survey when do we allocate more samples to the more established strata which strata have more non response rate what should we use when conducting customer surveys why should we do customer surveys how to measure response rate for customer survey can we use random sampling for surveys why do we conduct customer survey when is a customer survey used can you allocate more strata data based on non-response rates