A Researcher Wishes to Test the Effectiveness of a Flu

question 54

Essay

A researcher wishes to test the effectiveness of a flu vaccination. 150 people are vaccinated,
180 people are vaccinated with a placebo, and 100 people are not vaccinated. The number in
each group who later caught the flu was recorded. The results are shown below. $$\begin{array} { r | c c c } & \text { Vaccinated } & \text { Placebo } & \text { Control } \\\hline \text { Caught the flu } & 8 & 19 & 21 \\\text { Did not catch the flu } & 142 & 161 & 79\end{array}$$

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Definitions:

Homospory

Production of one type of spore that gives rise to a bisexual gametophyte. Compare with heterospory.

Morphological Type

Morphological Type refers to the classification of organisms based on their physical form and structure, which includes their shape, size, and other visible attributes.

Mosses

Small, green, non-vascular plants that typically form dense green clumps or mats, often in damp or shady locations.

Seedless Vascular Plants

Plants that have vascular tissue for the transport of water and nutrients but do not produce seeds, including ferns and horsetails.