W Economic sectors > W.21 Business Services > W.21.02 Advertising industry and opinion polling > Interview

... > N Related subject areas > N.09 Mathematical and statistical methods > N.09.02 Statistics > N.09.02.02 Statistical data collection > Data collection method > Interview

N Related subject areas > N.09 Mathematical and statistical methods > N.09.02 Statistics > N.09.02.02 Statistical data collection > Interview