Paired T-Test [Java Code]

//datas: indicates the differences of the pairs

package Statistics;
public class ComputingPairedTT {
// private float[] datas = {4,4,1,2,-3,5,3,2,-4,2,1,-1,2,7,0,7,6,3,4,-1};
private float[] datas = {-2,-1,1,0,-6,-6,-5,-10,-4};
public double ComputingSD(double mean){
float sum = 0;
for (int i =0; i < datas.length ; i++){
sum += (datas[i] - mean) * (datas[i] - mean);
}
return Math.sqrt(sum / (datas.length - 1) );
}
public double ComputingTT(){
double m = ComputingMean();
double se = ComputingSE(ComputingSD(m));
return m / se;
}
public double ComputingSE(double sd){
return sd / Math.sqrt(datas.length);
}
public double ComputingMean(){
float sum = 0;
for (int i = 0; i < datas.length ; i++){
sum += datas[i];
}
return sum/datas.length ;
}
public static void main(String[] args){
ComputingPairedTT csd = new ComputingPairedTT();
double mean = csd.ComputingMean();
System.out.println(mean);
double c = csd.ComputingSD(mean);
System.out.println(c);
double se = csd.ComputingSE(c);
System.out.println(se);
double tt = csd.ComputingTT();
System.out.println(tt);
}
}