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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