Consider the Following Results for Two Samples Randomly Taken from Two

question 149

Short Answer

Consider the following results for two samples randomly taken from two populations.
$\begin{array}{lcc}&\text { Sample A }&\text { Sample B }\\\text { Sample Size } & 25 & 38 \\\text { Sample Mean } & 66 & 60 \\\text { Sample Standard Deviation } & 5 & 7\end{array}$
a. What are the degrees of freedom for the t distribution?
b. At 95% confidence, compute the margin of error.
c. Develop a 95% confidence interval for the difference between the two population means.

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Definitions:

Synapomorphies

Shared derived characteristics or traits that are used to establish evolutionary relationships among species or groups.

Common Ancestor

The most recent individual from which all organisms in a group are directly descended.

Phylogenetic Systematics

A method of classifying organisms based on their evolutionary relationships, utilizing genetic, morphological, and other data to infer a "family tree" of life.

Dinosaur Genera

Categories in the classification of dinosaurs, where each genus comprises one or more species that are closely related.