What are Boolean variables used for in worksheet expressions?

Boolean variables are used in worksheet expressions to represent true or false conditions. They play a crucial role in decision-making processes within formulas, which can use these variables to evaluate logical statements. This enables users to create conditional expressions that can control the flow of data and determine outcomes within computations. For instance, in a worksheet, a Boolean variable could be used to check if a certain criterion is met and subsequently influence which calculations or data manipulations are performed based on that evaluation.

The other options listed do not accurately reflect the function of Boolean variables in worksheet expressions. Managing numeric data pertains to numerical analysis, formatting options relate to how data is visually presented, and handling string outputs involves text manipulation. None of these directly utilize the logic-based framework provided by Boolean variables.