Added output for Ex 17, 18, 19. Removed extra plt.show() from Ex19.

data/expected_example_output/example_18/Ex18_1_output.txt

@@ -0,0 +1 @@
+chi^2: 95.93

data/expected_example_output/example_18/Ex18_2_output.txt

@@ -0,0 +1 @@
+chi^2: 460.67

data/expected_example_output/example_18/example_18_output_1.dat

@@ -0,0 +1,100 @@
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