Before Jonas Salk Discovered a Vaccine to Prevent Polio,people Noticed

question 81

Multiple Choice

Before Jonas Salk discovered a vaccine to prevent polio,people noticed a correlation between outside temperature and the incidence of polio.Polio cases tended to occur more in the summer months than in the winter months,and the public assumed that high temperatures alone contributed to infection.As it turned out,there was a positive correlation between temperature and polio outbreaks because polio tended to be contracted in swimming pools and other places where children congregated.This illustrates which of the following? Correlations are

• A) indicative of a causal relation.
• B) variable.
• C) invalid.
• D) no guarantee of a causal relation.
• E) unreliable.

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Definitions:

Sumerians

An ancient civilization that developed in Mesopotamia (modern-day Iraq) around 4500 BCE, known for creating one of the world's first writing systems, cuneiform.

Raze Persepolis

Refers to the destruction of the ancient city of Persepolis, an important ceremonial capital of the Achaemenid Empire, traditionally attributed to Alexander the Great's army in 330 BCE.

Sasanian Dynasty

An Iranian dynasty that ruled from 224 to 651 AD, known for its significant cultural, architectural, and artistic achievements.

Athenian Acropolis

An ancient citadel located on a rocky outcrop above the city of Athens, Greece, containing the remains of several ancient buildings of great architectural and historic significance.