Instruction 15-6
Four Surgical Procedures Currently Are Used to Install

question 86

True/False

Instruction 15-6
Four surgical procedures currently are used to install pacemakers. If the patient does not need to return for follow-up surgery, the operation is called a 'clear' operation. A heart centre wants to compare the proportion of clear operations for the four procedures, and collects the following numbers of patients from their own records:
| Procedure |
$$\begin{array} { | l | c | c | c | c | c | } \hline & \text { A } & \text { B } & \text { C } & \text { D } & \text { Total } \\\hline \text { Clear } & 27 & 41 & 21 & 7 & 96 \\\hline \text { Return } & 11 & 15 & 9 & 11 & 46 \\\hline \text { Total } & 38 & 56 & 30 & 18 & 142 \\\hline\end{array}$$ They will use this information to test for a difference among the proportion of clear operations using a chi-square test with a 0.05 level of significance.
-Referring to Instruction 15-6,the null hypothesis will be rejected.

---

Definitions:

THC

The major active ingredient in marijuana; triggers a variety of effects, including mild hallucinations.

Marijuana

A psychoactive drug from the Cannabis plant used for medical or recreational purposes.

Motor Coordination

The harmonious function of body parts (such as muscles and limbs) enabling smooth and efficient movements.

THC

Tetrahydrocannabinol, the main psychoactive compound in cannabis that produces the "high" sensation.