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. $$\begin{array} { r | c c c } & \text { Vaccinated } & \text { Placebo } & \text { Control } \\\hline \text { Caught the flu } & 8 & 19 & 21 \\\text { Did not catch the flu } & 142 & 161 & 79\end{array}$$

---

Definitions:

Choice Reaction Time

The time it takes to respond to a stimulus when there are multiple possible responses.

Inspection Time

A measure of sensory processing speed, reflecting the minimum time needed for an individual to make a simple discrimination between stimuli.

Working Memory Capacity

The amount of information that an individual can hold and manipulate in their mind for a short period of time.

Mental Speed

A cognitive ability that refers to how quickly an individual can process information, often measured by tasks requiring rapid decision making.