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10 cards from this deck
Set of xxx values that lead to H0H_0H0 being rejected
Rejection region
P(X≥k)≤P(X \geq k) \leqP(X≥k)≤ significance level
P(X≤k)P(X \leq k)P(X≤k) crossing significance level boundary
0.025 (5% divided by 2)
Sum probabilities in both critical regions
When observed value falls in critical region
(1−sig level)(1 - \text{sig level})(1−sig level) boundary
X≤aX \leq aX≤a or X≥bX \geq bX≥b
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