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A provincial politician would like to determine the average amount earned during summer employment by the provinces teenagers during the past summer’s vacation period. She wants to have 95% confidence that the sample mean is within $25 of the actual population mean. Bases on past studies, she knows the amount earned is normally distributed with a standard deviation of $400. What sample size must she take?

  • statistics -

    95% = mean ± 1.96 SEm

    SEm = SD/√n

    25 = 1.96 (400/√n)

    Calculate n.

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