static public decimal Interval(int percent, int[] nums)
{
int df = nums.Length - 1;
decimal mean = Mean.findMean(nums);
decimal sd = StandardDeviation.findSD(nums);
decimal confidence = Multiplication.Product(percent, .01m);
decimal ans = Division.Quotient((1 - confidence), 2);
return(Tscore(df, ans));
}
public void decimalSDTest()
{
decimal[] nums = { 3.3M, 6.6M, 9.9M, 13.2M };
Assert.AreEqual(3.6895122M, StandardDeviation.findSD(nums));
}
public void intSDTest()
{
int[] nums = { 1, 2, 3, 4, 5 };
Assert.AreEqual(1.4142136M, StandardDeviation.findSD(nums));
}