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This is the user page for Paul Ripke (aka stix or stixpjr), who is a SRE and lives in Sydney and Wollongong , Australia . See his home page for more info.
z
=
x
1
¯
−
x
2
¯
s
x
1
¯
−
x
2
¯
=
x
1
¯
−
x
2
¯
s
1
2
z
1
+
s
2
2
z
2
=
3.1
−
3.15
1.265
2
204
+
1.35
2
196
=
−
0.382
{\displaystyle z={\frac {{\overline {x_{1}}}-{\overline {x_{2}}}}{s_{{\overline {x_{1}}}-{\overline {x_{2}}}}}}={\frac {{\overline {x_{1}}}-{\overline {x_{2}}}}{\sqrt {{\frac {s_{1}^{2}}{z_{1}}}+{\frac {s_{2}^{2}}{z_{2}}}}}}={\frac {3.1-3.15}{\sqrt {{\frac {1.265^{2}}{204}}+{\frac {1.35^{2}}{196}}}}}=-0.382}
