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How did we get 1.96 from the z table e-g. what is the Sample size needed when margin ay error to be I given that

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How did we get 1.96 from the z table

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e-g. what is the Sample size needed when margin ay error to be I given that st. deviation = 35 of d = 57. = 2.5 - 7 = 1. 96 2 n = ( 1 . 96 ) ( 35 ) 188.2384 2 189 5 =

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