3 files changed, 72 insertions, 0 deletions
diff --git a/1202/CH21/EX21.5/21_5.sce b/1202/CH21/EX21.5/21_5.sce
new file mode 100755
index 000000000..8b0c66a96
--- /dev/null
+++ b/1202/CH21/EX21.5/21_5.sce
@@ -0,0 +1,72 @@
+clear
+clc
+
+//Example 21.5
+disp('Example 21.5')
+
+//data
+x=[ 17.7    1380.  
+    23.6    1458.  
+    13.2    1322.  
+    25.2    1448.  
+    13.1    1334.  
+    27.8    1485.  
+    29.8    1503.  
+    9.      1540.  
+    14.3    1341.  
+    26.     1448.  
+    23.2    1426.  
+    22.8    1417.  
+    20.4    1384.  
+    17.5    1380.  
+    18.4    1396.  
+    16.8    1345.  
+    13.8    1349.  
+    19.4    1398.  
+    24.7    1426.  
+    16.8    1361.  
+    14.9    1347.  
+    27.6    1476.  
+    26.1    1454.  
+    20.     1393.  
+    22.9    1427.  
+    22.4    1431.  
+    19.6    1405.  
+    31.5    1521.  
+    19.9    1409.  
+    20.3    1392.];  
+
+
+T=mean(x,'r');
+s=sqrt(variance(x,'r'));
+
+UCL=T+3*s;
+LCL=T-3*s;
+
+p=size(x,1)
+
+subplot(2,1,1);
+plot2d(repmat(UCL(1),1,p));
+plot2d(repmat(LCL(1),1,p));
+plot2d(repmat(T(1),1,p));
+plot2d(x(:,1),style=-1,rect=[0,0,32,40])
+xtitle('Example 21.4','Sampling number','BOD (mg/L)')
+
+
+subplot(2,1,2);
+plot2d(repmat(UCL(2),1,p));
+plot2d(repmat(LCL(2),1,p));
+plot2d(repmat(T(2),1,p));
+plot2d(x(:,2),style=-1,rect=[0,1200,32,1600])
+xtitle('','Sampling number','Solids (mg/L)')
+
+//subplot(3,1,3);
+scf()
+plot2d(x(8,1),x(8,2),style=-3,rect=[0,1200,40,1600])
+plot2d(x(:,1),x(:,2),style=-1,rect=[0,1200,40,1600])
+legend("Sample #8",position=4)
+xtitle('','BOD (mg/L)','Solids (mg/L)')
+
+mprintf('\nThe confidence interval for third case is not drawn\n...
+    because it is beyond the scope of this book')
+
diff --git a/1202/CH21/EX21.5/21_5a.png b/1202/CH21/EX21.5/21_5a.png
new file mode 100755
index 000000000..0ca43a91b
--- /dev/null
+++ b/1202/CH21/EX21.5/21_5a.png
diff --git a/1202/CH21/EX21.5/21_5b.png b/1202/CH21/EX21.5/21_5b.png
new file mode 100755
index 000000000..c079d1388
--- /dev/null
+++ b/1202/CH21/EX21.5/21_5b.png