How Did Robert Koch Determine That It Was Bacteria That

question 41

Multiple Choice

How did Robert Koch determine that it was bacteria that caused the disease anthrax?

• A) Everybody at the time knew anthrax was caused by bacteria.
• B) He injected mice with anthrax infected material, and they all came down with anthrax, while those injected with healthy material did not.
• C) He put mice in close proximity to healthy and to anthrax-infected animals and only those near the sick animals contracted anthrax.
• D) He photographed the anthrax bacteria.
• E) He infected himself with anthrax bacteria and contracted the disease.

---

Definitions:

Population Mean

The average of all the values in a population, representing the central point around which the data points in the population are distributed.

Two-Tailed Test

A statistical test where the significance area is on both ends of the distribution, examining if a sample falls outside a specific value range on either side.

Null Hypothesis

A hypothesis used in statistics that proposes no significant difference or effect, serving as the default assumption to be tested against an alternative hypothesis.

Test Statistic

A value determined from sample data, used to make decisions on a hypothesis in statistical testing.