Sampling Plan
After choosing the research approach and instruments, the marketing researcher must design a sampling plan. This calls for three decisions:
1.Sampling unit: Whom should we survey?
In the American Airlines survey, should the sampling unit consist of first-class business travelers, first-class vacation travelers, or both? Should it include travelers under age 18?
With the sampling unit chosen, marketers must next develop a sampling frame so everyone in the target population has an equal or known chance of being sampled.
2.Sample size: How many people should we survey?
Large samples give more reliable results, but it’s not necessary to sample the entire target population to achieve reliable results. Samples of less than 1 percent of a population can often provide good reliability with a credible sampling procedure.
3.Sampling procedure: How should we choose the respondents?
Probability sampling allows marketers to calculate confidence limits for sampling error and makes the sample more representative.