Question

1) A recent study of over 400,000 older people in eight states ask 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?

b) Identify the population and the sample

c) Is this an observational study or an experiment ? Explain.

Answer 1

a) What is the statistical question that the researchers were trying to answer?

The statistical question that the researchers were trying to answer is if coffee drinkers tend to live longer than non-coffee drinkers.

b) Identify the population and the sample

The population is people in eight states who drink coffee.

The sample is 400,000 older people in eight states who drink coffee.

c) Is this an observational study or an experiment ? Explain.

This is an observational study because coffee drinkers are followed for 13 years to find that coffee drinkers tend to live longer than non-coffee drinkers.

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