Question: z = (0.12 - 0.1133) / sqrt [ 0.1171 ( 1 - 0.1171 ) ( (1/200) + (1/150) ) ] z = 0.0067 / sqrt

z = (0.12 - 0.1133) / sqrt [ 0.1171 ( 1 - 0.1171 ) ( (1/200) + (1/150) ) ] z = 0.0067 / sqrt [ 0.1171 0.8829 0.0117 ] z = 0.0067 / 0.0048

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z = (0.12 - 0.1133) / sqrt [ 0.1171 ( 1 - 0.1171 ) ( (1/200) + (1/150) ) ] z = 0.0067 / sqrt [ 0.1171 0.8829 0.0117 ] z = 0.0067 / 0.0048

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