A Researcher Wishes to Test the Effectiveness of a Flu

question 24

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. $$\begin{array} { r | c c c } & \text { Vaccinated } & \text { Placebo } & \text { Control } \\\hline \text { Caught the flu } & 8 & 19 & 21 \\\text { Did not catch the flu } & 142 & 161 & 79\end{array}$$ Use a 0.05 significance level to test the claim that the proportion of people catching the flu is the same in all three groups.

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Definitions:

Accounts Payable

The amount of money a company owes to its suppliers or vendors for goods and services received but not yet paid for.

Line of Credit

A flexible loan from a bank or financial institution that sets a maximum amount of money the borrower can access and use over a period.

Cross-functional

Involving or requiring collaboration among different departments, specialties, or areas of expertise within an organization.

Collaborative Selling

A sales approach where sellers work closely with buyers to identify and meet their needs, fostering a partnership rather than a transactional relationship.