Final answer:
A flag-controlled while loop indeed uses a boolean variable, which is true. This variable is critical for determining whether the loop continues or stops.
Step-by-step explanation:
The statement that the control variable in a flag-controlled while loop is a bool variable is True. A flag-controlled while loop uses a boolean variable (often referred to as a flag) to control whether the loop continues to execute or stops. This boolean variable, which represents the flag, is typically set to true or false at the beginning of the program, and it is checked at each iteration of the loop. If the flag is true, the loop continues; if the flag is set to false, the loop terminates. It is crucial for the proper function of the loop control mechanism.
In scientific experimentation, as a separate concept, a control group must be nearly identical to the test group except for the experimental variable being tested. This practice allows researchers to isolate the effects of the variable in question. However, this aspect of scientific experimentation is unrelated to flag-controlled while loops in programming.