Question

a recent study of over 400,000 older people in eight states asked participants whether or not they drank coffee, and followed them for 13 years. the researchers found that coffee drinkers tend to live longer than non - coffee drinkers. (a) what is the statistical question that the researchers were trying to answer? does drinking coffee reduce health costs for older people? how many older people drink coffee? is there an association between coffee drinking and longevity of life? why do older people choose to drink coffee? (b) identify the population and sample in this setting. leave all incorrect options in the answer bank. population: sample:

Explanation:

Step1: Analyze the study goal

The researchers want to know if coffee - drinking affects the longevity of older people.

Step2: Identify the statistical question

The main question is about the relationship between coffee - drinking and health costs (related to longevity) for older people. So the statistical question is "Does drinking coffee reduce health costs for older people?"

Step3: Determine population and sample

The population is all older people (over 400,000 in eight states). The sample is the participants in the study who were asked about coffee - drinking.

Answer:

(a) Does drinking coffee reduce health costs for older people?
(b) Population: All older people in eight states (over 400,000). Sample: Participants in the study who were asked about coffee - drinking.