Final answer:
The nationwide survey of BMI that started in 1985 and now includes landline and cell phone sampling is called the National Health and Nutrition Examination Survey (NHANES). This survey is conducted by the CDC and collects data on various health-related topics, including BMI, through interviews, physical examinations, and laboratory tests. It uses a combination of landline and cell phone sampling to ensure a representative sample of the population.
Step-by-step explanation:
The nationwide survey of BMI that started in 1985 and now includes landline and cell phone sampling is called the National Health and Nutrition Examination Survey (NHANES).
The NHANES is conducted by the Centers for Disease Control and Prevention (CDC) and is aimed at assessing the health and nutritional status of adults and children in the United States. It collects data on a wide range of health-related topics, including BMI, through interviews, physical examinations, and laboratory tests.
This survey uses a combination of landline and cell phone sampling to ensure that a representative sample of the population is included. The inclusion of cell phone sampling is particularly important as more people rely exclusively on cell phones and may not have a landline.