diff --git a/src/main/java/info/istlab/Zemi01/NumericDemo.java b/src/main/java/info/istlab/Zemi01/NumericDemo.java
index 21109a5..6461861 100644
--- a/src/main/java/info/istlab/Zemi01/NumericDemo.java
+++ b/src/main/java/info/istlab/Zemi01/NumericDemo.java
@@ -3,7 +3,7 @@
 public class NumericDemo {
     public static void main(String[] args) {
         // ランチャーを起動する場合
-        String[] opts = { "IEEE754view", "Lagrange", "RegLine", "NormalDistribution" };
+        String[] opts = { "IEEE754view", "Lagrange", "RegLine", "NormalDistribution","WelchTtest" };
         Launcher.show(opts, "info.istlab.Zemi01.numeric");
     }
 }
diff --git a/src/main/java/info/istlab/Zemi01/numeric/NormalDistribution.java b/src/main/java/info/istlab/Zemi01/numeric/NormalDistribution.java
index b4649e6..a39e1fc 100644
--- a/src/main/java/info/istlab/Zemi01/numeric/NormalDistribution.java
+++ b/src/main/java/info/istlab/Zemi01/numeric/NormalDistribution.java
@@ -5,6 +5,8 @@
 import java.awt.Graphics;
 import java.awt.Graphics2D;
 import java.awt.RenderingHints;
+import java.awt.event.KeyEvent;
+import java.awt.event.KeyListener;
 import java.awt.event.MouseEvent;
 import java.awt.event.MouseListener;
 import java.awt.event.MouseMotionListener;
@@ -22,7 +24,7 @@
  * 正規分布、ガウス分布
  */
 
-public class NormalDistribution extends JPanel implements MouseListener, MouseMotionListener {
+public class NormalDistribution extends JPanel implements MouseListener, MouseMotionListener, KeyListener {
 
 	private static final long serialVersionUID = -919448575666487391L;
 	public static JFrame jf;
@@ -40,7 +42,7 @@
 		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 		System.out.println("正規分布、ガウス分布 ");
 		System.out.println("つかいかた：(1)右クリックで、点を追加 (2)左ドラッグで、点移動 or グラフ移動 (3) 点の上で右クリックすると、点が消えます。");
-
+		System.out.println("Enterをおすと、ランダムな点を生成します。");
 	}
 
 	Point2D offset;
@@ -94,19 +96,25 @@
 	public NormalDistribution() {
 		offset = new Point2D.Double(0, 100);
 
-		points = new ArrayList<Point2D>();
 		dim = new Dimension(500, 400);
 		addMouseListener(this);
 		addMouseMotionListener(this);
+		addKeyListener(this);
+		this.setFocusable(true);
+		this.requestFocusInWindow();
 
+		replot();
+		setBackground(Color.white);
+		setForeground(Color.black);
+	}
+	public void replot(){
+		points = new ArrayList<Point2D>();
 		Random rand = new Random();
 		for (int i = 0; i < 7; i++) {
 			int randx = rand.nextInt(-40, 40);
 			int randy = rand.nextInt(-10,0);
 			points.add(new Point2D.Double(randx, randy));
 		}
-		setBackground(Color.white);
-		setForeground(Color.black);
 	}
 
 	public void paint(Graphics g) {
@@ -275,4 +283,26 @@
 		repaint();
 	}
 
+	@Override
+	public void keyTyped(KeyEvent e) {
+		// TODO Auto-generated method stub
+
+	}
+
+	@Override
+	public void keyPressed(KeyEvent e) {
+		if (e.getKeyCode() == KeyEvent.VK_ENTER) {
+			replot();
+			updateNormDist();
+			repaint();
+		}
+
+	}
+
+	@Override
+	public void keyReleased(KeyEvent e) {
+		// TODO Auto-generated method stub
+
+	}
+
 }
diff --git a/src/main/java/info/istlab/Zemi01/numeric/WelchTtest.java b/src/main/java/info/istlab/Zemi01/numeric/WelchTtest.java
index 02cb95d..4bb3e2c 100644
--- a/src/main/java/info/istlab/Zemi01/numeric/WelchTtest.java
+++ b/src/main/java/info/istlab/Zemi01/numeric/WelchTtest.java
@@ -42,6 +42,7 @@
 		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 		System.out.println("正規分布、ガウス分布 ");
 		System.out.println("つかいかた：(1)右クリックで、点を追加 (2)左ドラッグで、点移動 or グラフ移動 (3) 点の上で右クリックすると、点が消えます。");
+		System.out.println("Enterをおすと、ランダムな点を生成します。");
 	}
 
 	Point2D offset;
@@ -278,7 +279,7 @@
 	@Override
 	public void keyPressed(KeyEvent e) {
 		if (e.getKeyCode() == KeyEvent.VK_ENTER) {
-			System.out.println(e.getKeyCode());
+			// System.out.println(e.getKeyCode());
 
 			normdist[0] = new ND(Color.blue, 0, 0);
 			normdist[1] = new ND(Color.green, 20, -30);