/**
 * PostgreSQL Statistics Tools - Math Utilities
 *
 * P-value calculation utilities and validation helpers
 * used by the advanced statistics tools.
 */
import type { PostgresAdapter } from "../../postgres-adapter.js";
/**
 * Calculate two-tailed p-value for a t-test.
 *
 * @param t - The t-statistic
 * @param df - Degrees of freedom
 * @returns Two-tailed p-value
 */
export declare function calculateTTestPValue(t: number, df: number): number;
/**
 * Calculate two-tailed p-value for a z-test.
 *
 * @param z - The z-statistic
 * @returns Two-tailed p-value
 */
export declare function calculateZTestPValue(z: number): number;
/**
 * Validate that a table exists and a column is numeric.
 * Throws user-friendly error messages for missing table/column.
 */
export declare function validateNumericColumn(adapter: PostgresAdapter, table: string, column: string, schema: string): Promise<void>;
/**
 * Validate that a table exists (for tools that don't require a specific column).
 * Throws user-friendly error message for missing table.
 */
export declare function validateTableExists(adapter: PostgresAdapter, table: string, schema: string): Promise<void>;
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