Statistical Techniques for Transportation Engineering

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Girls	${\bar{x}}_{1} = 84$	SD of S₁=10	n₁=121
Boys	${\bar{x}}_{2} = 80$	SD of S₂=14	n₂=81

Is the difference between the standard deviations (SDs) significant?

Solution: Null hypothesis $H_{0} : σ_{1} = σ_{2}$

Alternative hypothesis: $H_{1} : σ_{1} \neq σ_{2}$ (two-tailed test)

Level of significance=5%

Z=1.96 at 5% level ...

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