Final answer:
The switch statement is not well-suited for testing against a range of values; it is designed for matching a variable with specific cases. In experimental design, the control group should match the test group in every aspect except the variable under study.
Step-by-step explanation:
The switch statement is useful when you need to test a single variable against a series of values. However, it is not suitable for testing against a series of any of the following values except a(n) range of values. A switch statement can test for equality against a number of specific values, but it cannot be used to test a range without breaking it down into individual cases. For scenarios that require checking a variable against a range, an if-else statement is more appropriate.
In the context of the provided options, the following statement is accurate: 'c. The control group must be identical to the test group except for one variable.' This means in an experimental setup, the control group and test group should be kept as similar as possible so that the only significant difference between them is the variable being tested. This allows the experiment to effectively assess the impact of that variable.