In a Test of a New Surgical Procedure, the Five $\quad$

question 43

Multiple Choice

In a test of a new surgical procedure, the five most respected surgeons in FlatBroke Township were invited to Carver Hospital. Each surgeon was assigned two patients of the same age, gender, and overall health. One patient was operated upon in the old way, and the other in the new way. Both procedures are considered equally safe. The surgery times are shown below: $\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\quad$$\text { Surgeon }$
$\begin{array} { |c | c | c | c | c | c | } \hline { \text { Allen } } & { \text { Bob } } & { \text { Chloe } } & \text { Daphne } & { \text { Edgar } } \\\hline \text { Old way } & 36 & 55 & 28 & 40 & 62 \\\hline \text { New way } & 31 & 45 & 28 & 35 & 57 \\\hline\end{array}$ Which test should we use to test for zero difference in mean times?

• A)Paired t-test
• B)Independent samples t-test
• C)Independent samples z test
• D)Cannot be sure without knowing ?.

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Definitions:

Mark-up

The amount added to the cost price of goods to cover overhead and profit; the difference between the selling price and the cost price.

Sale Price

The final amount at which an item or service is sold after any discounts or deductions.

Operating Profit

Earnings before interest and taxes (EBIT), reflecting the profit a company makes from its operations, before financial and other non-operational costs.

Reduced Price

A lower cost for goods or services, typically offered during sales, discounts, or promotions.