diff --git a/applications/lazstats/docs/HelpNDoc/LazStats.hnd b/applications/lazstats/docs/HelpNDoc/LazStats.hnd
index 658a6d724..3ea0211a7 100644
Binary files a/applications/lazstats/docs/HelpNDoc/LazStats.hnd and b/applications/lazstats/docs/HelpNDoc/LazStats.hnd differ
diff --git a/applications/lazstats/docs/chm/LazStats.chm b/applications/lazstats/docs/chm/LazStats.chm
index 23dec6352..7efb50b6d 100644
Binary files a/applications/lazstats/docs/chm/LazStats.chm and b/applications/lazstats/docs/chm/LazStats.chm differ
diff --git a/applications/lazstats/source/forms/analysis/measurement_programs/kr21unit.lfm b/applications/lazstats/source/forms/analysis/measurement_programs/kr21unit.lfm
index 781a348bc..9a0957fa8 100644
--- a/applications/lazstats/source/forms/analysis/measurement_programs/kr21unit.lfm
+++ b/applications/lazstats/source/forms/analysis/measurement_programs/kr21unit.lfm
@@ -15,10 +15,10 @@ object KR21Frm: TKR21Frm
   object ResetBtn: TButton
     AnchorSideTop.Control = Bevel1
     AnchorSideTop.Side = asrBottom
-    AnchorSideRight.Control = CancelBtn
-    Left = 4
+    AnchorSideRight.Control = ComputeBtn
+    Left = 80
     Height = 25
-    Top = 128
+    Top = 140
     Width = 54
     Anchors = [akTop, akRight]
     AutoSize = True
@@ -30,31 +30,13 @@ object KR21Frm: TKR21Frm
     OnClick = ResetBtnClick
     TabOrder = 1
   end
-  object CancelBtn: TButton
-    AnchorSideTop.Control = Bevel1
-    AnchorSideTop.Side = asrBottom
-    AnchorSideRight.Control = ComputeBtn
-    Left = 66
-    Height = 25
-    Top = 128
-    Width = 62
-    Anchors = [akTop, akRight]
-    AutoSize = True
-    BorderSpacing.Left = 8
-    BorderSpacing.Top = 8
-    BorderSpacing.Right = 8
-    BorderSpacing.Bottom = 8
-    Caption = 'Cancel'
-    ModalResult = 2
-    TabOrder = 2
-  end
   object ComputeBtn: TButton
     AnchorSideTop.Control = Bevel1
     AnchorSideTop.Side = asrBottom
-    AnchorSideRight.Control = ReturnBtn
-    Left = 136
+    AnchorSideRight.Control = CloseBtn
+    Left = 142
     Height = 25
-    Top = 128
+    Top = 140
     Width = 76
     Anchors = [akTop, akRight]
     AutoSize = True
@@ -64,26 +46,26 @@ object KR21Frm: TKR21Frm
     BorderSpacing.Bottom = 8
     Caption = 'Compute'
     OnClick = ComputeBtnClick
-    TabOrder = 3
+    TabOrder = 2
   end
-  object ReturnBtn: TButton
+  object CloseBtn: TButton
     AnchorSideTop.Control = Bevel1
     AnchorSideTop.Side = asrBottom
     AnchorSideRight.Control = Owner
     AnchorSideRight.Side = asrBottom
-    Left = 220
+    Left = 226
     Height = 25
-    Top = 128
-    Width = 61
+    Top = 140
+    Width = 55
     Anchors = [akTop, akRight]
     AutoSize = True
     BorderSpacing.Left = 8
     BorderSpacing.Top = 8
     BorderSpacing.Right = 8
     BorderSpacing.Bottom = 8
-    Caption = 'Return'
-    ModalResult = 1
-    TabOrder = 4
+    Caption = 'Close'
+    ModalResult = 11
+    TabOrder = 3
   end
   object Bevel1: TBevel
     AnchorSideLeft.Control = Owner
@@ -91,10 +73,10 @@ object KR21Frm: TKR21Frm
     AnchorSideTop.Side = asrBottom
     AnchorSideRight.Control = Owner
     AnchorSideRight.Side = asrBottom
-    AnchorSideBottom.Control = ReturnBtn
+    AnchorSideBottom.Control = CloseBtn
     Left = 0
     Height = 8
-    Top = 112
+    Top = 124
     Width = 289
     Anchors = [akTop, akLeft, akRight]
     Shape = bsBottomLine
@@ -104,15 +86,15 @@ object KR21Frm: TKR21Frm
     AnchorSideLeft.Side = asrCenter
     AnchorSideTop.Control = Owner
     Left = 34
-    Height = 104
+    Height = 116
     Top = 8
     Width = 221
     AutoSize = True
-    BorderSpacing.Left = 8
+    BorderSpacing.Left = 16
     BorderSpacing.Top = 8
-    BorderSpacing.Right = 8
+    BorderSpacing.Right = 16
     BevelOuter = bvNone
-    ClientHeight = 104
+    ClientHeight = 116
     ClientWidth = 221
     TabOrder = 0
     object Label1: TLabel
@@ -160,7 +142,7 @@ object KR21Frm: TKR21Frm
       AnchorSideRight.Control = RelEdit
       Left = 0
       Height = 15
-      Top = 85
+      Top = 97
       Width = 138
       Anchors = [akTop, akRight]
       BorderSpacing.Right = 8
@@ -214,13 +196,13 @@ object KR21Frm: TKR21Frm
     end
     object RelEdit: TEdit
       AnchorSideLeft.Control = NoItemsEdit
-      AnchorSideTop.Control = StdDevEdit
+      AnchorSideTop.Control = Bevel2
       AnchorSideTop.Side = asrBottom
       AnchorSideRight.Control = Panel1
       AnchorSideRight.Side = asrBottom
       Left = 146
       Height = 23
-      Top = 81
+      Top = 93
       Width = 75
       Alignment = taRightJustify
       Anchors = [akTop, akLeft, akRight]
@@ -230,5 +212,19 @@ object KR21Frm: TKR21Frm
       ReadOnly = True
       TabOrder = 3
     end
+    object Bevel2: TBevel
+      AnchorSideLeft.Control = Panel1
+      AnchorSideTop.Control = StdDevEdit
+      AnchorSideTop.Side = asrBottom
+      AnchorSideRight.Control = Panel1
+      AnchorSideRight.Side = asrBottom
+      Left = 0
+      Height = 4
+      Top = 85
+      Width = 221
+      Anchors = [akTop, akLeft, akRight]
+      BorderSpacing.Top = 8
+      Shape = bsTopLine
+    end
   end
 end
diff --git a/applications/lazstats/source/forms/analysis/measurement_programs/kr21unit.pas b/applications/lazstats/source/forms/analysis/measurement_programs/kr21unit.pas
index 13240bf3f..2d9ede36e 100644
--- a/applications/lazstats/source/forms/analysis/measurement_programs/kr21unit.pas
+++ b/applications/lazstats/source/forms/analysis/measurement_programs/kr21unit.pas
@@ -14,11 +14,11 @@ type
 
   TKR21Frm = class(TForm)
     Bevel1: TBevel;
+    Bevel2: TBevel;
     Panel1: TPanel;
     ResetBtn: TButton;
-    CancelBtn: TButton;
     ComputeBtn: TButton;
-    ReturnBtn: TButton;
+    CloseBtn: TButton;
     NoItemsEdit: TEdit;
     MeanEdit: TEdit;
     StdDevEdit: TEdit;
@@ -49,21 +49,20 @@ uses
 
 procedure TKR21Frm.ResetBtnClick(Sender: TObject);
 begin
-     NoItemsEdit.Text := '';
-     MeanEdit.Text := '';
-     StdDevEdit.Text := '';
-     RelEdit.Text := '';
+  NoItemsEdit.Text := '';
+  MeanEdit.Text := '';
+  StdDevEdit.Text := '';
+  RelEdit.Text := '';
 end;
 
 procedure TKR21Frm.FormActivate(Sender: TObject);
 var
   w: Integer;
 begin
-  w := MaxValue([ResetBtn.Width, CancelBtn.Width, ComputeBtn.Width, ReturnBtn.Width]);
+  w := MaxValue([ResetBtn.Width, ComputeBtn.Width, CloseBtn.Width]);
   ResetBtn.Constraints.MinWidth := w;
-  CancelBtn.Constraints.MinWidth := w;
   ComputeBtn.Constraints.MinWidth := w;
-  ReturnBtn.Constraints.MinWidth := w;
+  CloseBtn.Constraints.MinWidth := w;
 end;
 
 procedure TKR21Frm.FormShow(Sender: TObject);
@@ -73,14 +72,13 @@ end;
 
 procedure TKR21Frm.ComputeBtnClick(Sender: TObject);
 var
-   items, mean, stddev, rel : double;
+  items, mean, stddev, rel: double;
 begin
-     items := StrToFloat(NoItemsEdit.Text);
-     mean := StrToFloat(MeanEdit.Text);
-     stddev := StrToFloat(StdDevEdit.Text);
-     rel := (items / (items - 1.0)) * (1.0 - (mean * (items - mean))/
-          (items * sqr(stddev)));
-     RelEdit.Text := FormatFloat('0.00000', rel);  //FloatToStr(rel);
+  items := StrToFloat(NoItemsEdit.Text);
+  mean := StrToFloat(MeanEdit.Text);
+  stddev := StrToFloat(StdDevEdit.Text);
+  rel := (items / (items - 1.0)) * (1.0 - (mean * (items - mean))/(items * sqr(stddev)));
+  RelEdit.Text := FormatFloat('0.00000', rel);
 end;
 
 initialization