Two Surgical Procedures Are Widely Used to Treat a Certain

question 69

Essay

Two surgical procedures are widely used to treat a certain type of cancer. To compare the success rates of the two procedures, random samples of surgical patients were obtained and the numbers of patients who showed no recurrence of the disease after a 1-year period were recorded. The data are shown in the table.
$$\begin{array} { l c c } \hline & n & \text { Number of Successes } \\\hline \text { Procedure A } & 100 & 77 \\\text { Procedure B } & 100 & 87 \\\hline\end{array}$$ How large a sample would be necessary in order to estimate the difference in the true success rates to within .10 with 95% reliability?

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Definitions:

Personality Development

The gradual and enduring changes in a person's behavior and thought patterns over the course of their life.

Oedipus Complex

A Freudian theory proposing that a child feels a subconscious sexual attraction to the opposite-sex parent and hostility toward the same-sex parent.

Defense Mechanisms

Psychological strategies employed unconsciously to protect oneself from anxiety arising from unacceptable thoughts or feelings.

Repression

A defense mechanism where stressful thoughts or memories are unconsciously pushed out of conscious awareness.