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{"ops":[{"insert":"A recent study claims that girls and boys do not perform the same on math tests taken from a\ngrade 12. Suppose that in a representative sample, 344 of 430 girls and 369 of 450 boys score at\nproficient or advanced levels on a standardized math test. The principal wants to examine whether\nthe proportion of girls who score at proficient or advanced levels differs from the proportion of boys\nat 5% level of significance.\nWhich one of the following statements is incorrect?\n1. pO1 D 0:8 and pO2 D 0:82:\n2. The standard error for pO1\u00a0\n"}]}
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