Lower bound of Wilson score confidence interval for a Bernoulli parameter(fix: 0.9604)

Rating.cs

using System;

namespace Rating
{
  class Program
  {
    /// <summary >
    /// Ratings
    /// (Lower bound of Wilson score confidence interval for a Bernoulli parameter)
    /// </summary>
    /// <param name="positive">Positive ratings</param>
    /// <param name="negative">Negative ratings</param>
    /// <returns></returns>
    public static double Rating(int positive, int negative)
    {
      return (((positive + 1.9208) / (positive + negative) - 1.96 * Math.Sqrt(((positive * negative) / (positive + negative)) + 0.9604) / (positive + negative)) / (1 + 3.8416 / (positive + negative)));
    }

    static void Main(string[] args)
    {
      // tests
      Console.WriteLine(Rating(10, 10).ToString());
      Console.WriteLine(Rating(438, 10).ToString());
      Console.WriteLine(Rating(1, 0).ToString());
      Console.WriteLine(Rating(0, 13).ToString());
      Console.WriteLine(Rating(30, 760).ToString());
      Console.ReadKey();
    }
  }
}

Thank you!
That would be cool to provde the results of the tests, just to make sure I ported the function correctly in PHP ^^