A Study of Drug Addicts in Amsterdam Recorded How Often

question 14

Multiple Choice

A study of drug addicts in Amsterdam recorded how often each addict had recently injected drugs and whether or not the addict was infected with HIV, the virus that causes AIDS. Here is a two-way table of the numbers of addicts in each condition:

From the data in the two-way table, about what is the value of the correlation between whether an addict is infected with HIV and how often he or she injects drugs?

• A) Small but positive, say, r = 0.2.
• B) Quite large and positive, say, r = 0.8.
• C) Very small, close to r = 0.
• D) Small but negative, say, r = -0.2.
• E) r makes no sense for these data.

Understand the impact of synthetic substances on human health and the environment.

Recognize the significance of disease vectors and the transmission routes of infectious diseases.

Identify key factors and strategies in controlling and preventing infectious and non-infectious diseases.

Comprehend the principles and importance of immunization in disease prevention.

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