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=D Z- Score for 95. 1. confidence interval = 1.96 - Let the sample size is = n Margin of error = 5 x Z

=D Z- Score for 95. 1. confidence interval = 1.96 - Let the sample size is = n Margin of error = 5 x Z ( E ) 4. 4 = 47.5 x 1 . 96 Fu = 21.159 = 447. 7 n = 44 8 - the required sample size

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