This solid design method nullifies the possibility of under coverage and helps to provide transparent data on the most recent topic at hand. (Random Sampling, 2009) They then select random landline respondents within a household based on which member has had the most recent birthday; keeping their survey as randomized as possible as they interview landline respondents within each household. Gallup also expects a minimum quota of 60% cell phone respondents and 40% landline respondents. (How Does the Gallup-Healthways Well-Being Index Work?,
This solid design method nullifies the possibility of under coverage and helps to provide transparent data on the most recent topic at hand. (Random Sampling, 2009) They then select random landline respondents within a household based on which member has had the most recent birthday; keeping their survey as randomized as possible as they interview landline respondents within each household. Gallup also expects a minimum quota of 60% cell phone respondents and 40% landline respondents. (How Does the Gallup-Healthways Well-Being Index Work?,