Q167·Section III (Statistics)·167 of 180Double sampling — filling a gap in auxiliary-variable coverageDouble sampling is useful: OptionsAWhen complete information on auxiliary variable is not availableBWhen population is heterogeneousCTo improve the performance of ratio estimator for population meanDTo improve the performance of regression estimator for population meanPick an option to check your answer.Show answerShow solution Report a problem with this question← Q166All questionsQ168 →Keyboard: A–D answer · S solution · ←/→ previous/next