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f12.6 H0: y = 20 HA: p at 20 Two-tail test Since I: = 100 > 30, using CLT, f ~ Normal; 0' =12 (known),

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\f12.6 H0: y = 20 HA: p at 20 Two-tail test Since I: = 100 > 30, using CLT, f ~ Normal; 0' =12 (known), use 2. . . X - Test statistic: Z = mg Level of signicance: a = 0.01 Decision rule: Reject Ho if |Z| > 2.33 Value ofthe test statistic: z: X'\" = M = 1.92 (ThIn (12/J100) Conclusion: As = 1.92

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