Four Surgical Procedures Currently Are Used to Install Pacemakers

question 1

Multiple Choice

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 center wants to
Compare the 4 procedures, and collects the following numbers of patients from their own records:
Which of the following tests will be the most appropriate to find out whether the 4 procedures
Are equally effective?

• A) test for difference in proportions.
• B) Z test for difference in proportions.
• C) One-way ANOVA F test for differences among more than two means
• D) Kruskal-Wallis rank Test.

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Definitions:

Independent Variable

The variable in an experiment that is manipulated or changed to observe its effect on the dependent variable.

Dependent Variable

In an experiment, a variable presumed to be influenced by the independent variable being tested.

Experimental Group

In scientific research, the group of subjects that receive the treatment or condition being tested.

Smallest Unit

The smallest measurable or functional element or part of something, often referred to in different contexts (e.g., atom in physics, cell in biology).