import type { WorkSamplingInput, WorkSamplingResult } from './types.js';
/**
 * Work Sampling Analysis
 *
 * @formula
 *   proportion = activityObservations / totalObservations
 *   requiredObservations = z² × p × (1 - p) / e²
 *   marginOfError = z × √(p × (1 - p) / totalObservations)
 *
 * @reference Barnes, R.M. (1980). "Motion and Time Study".
 * @reference ILO. "Introduction to Work Study".
 *
 * @throws {RangeError} Total observations must be a positive integer
 * @throws {RangeError} Activity observations must be between 0 and total observations
 * @throws {RangeError} Confidence must be between 0 and 1 (exclusive)
 * @throws {RangeError} Accuracy must be a positive number
 */
export declare function workSampling(input: WorkSamplingInput): WorkSamplingResult;
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