A Group of Investigators Is Exploring Trends in the Incidence

question 571

Multiple Choice

A group of investigators is exploring trends in the incidence of coronary heart disease (CHD) in a large population.  The investigators studied several factors in relation to the incidence of the disease.  The relationships between cigarette sales in the population (in average number of cigarette packs sold per person per day) and the incidence of CHD (per 1000 people) over time are given on the figure below: Which of the following is the best statement concerning the results of the study?

• A)Coronary heart disease (CH
• D) incidence shows no stable trend over time
• B)Individuals from this population who quit smoking have a decreased risk of CHD
• C)Sales of cigarettes in the population increased over time
• D)The plot cannot provide individual-level conclusions
• E)There are discordant changes in cigarette sales and CHD incidence

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Definitions:

Hypothesis

A tentative explanation of the relationships among certain phenomena.

Sound Pitch

The auditory perception of the frequency of a sound wave, which determines the highness or lowness of a tone.

Branches of Linguistics

Various fields of study within the discipline of linguistics, including phonetics, phonology, morphology, syntax, semantics, pragmatics, and others, focusing on different aspects of language.

Linguistics

The scientific study of language and its structure, including the study of morphology, syntax, phonetics, and semantics.