In Testing for Differences Between the Means of 2 Related $n - 1$

question 77

Short Answer

In testing for differences between the means of 2 related populations where the variance of the differences is unknown, the degrees of freedom are a) $n - 1$ .
b) $n _ { 1 } + n _ { 2 } - 1$ .
c) $n _ { 1 } + n _ { 2 } - 2$ .
d) $n - 2$ .

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Definitions:

Representative Clade

A group of organisms that includes an ancestor and all of its descendants, representing a single branch on the tree of life.

Supergroup

In biology, a high-level classification rank above kingdom, used in some recent taxonomic systems to organize the diversity of life.

Trypanosomes

Single-celled parasitic organisms responsible for diseases like African sleeping sickness and Chagas' disease, transmitted by insect vectors.

Foraminiferans

Single-celled protists with shells, known for their role in marine ecosystems and as indicators of environmental change.