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<ul><li>Find the critical values X<sup>2</sup><sub>α/2</sub> and

X<sup>2</sup><sub>1-α/2</sub> for the given level of confidence and sample size</li> <li>90% confidence, n = 20</li> <li>95% confidence, n = 25</li> <li>98% confidence, n = 23</li> <li>99% confidence, n = 102</li></ul>

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a) α = 1 − 90
= 1 − 0.9 = 0.1
100 α = 0.1
χ21− α = χ21− α = χ21− 0.1 (df = n − 1)
2 2 2 = χ20.95 (df = 19) = 10.117 (from χ2 table having right tail areas)

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