1. What sample size is needed to estimate the mean white blood cell count (in cells...

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Answer 1

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Answer #1

1
sd = 2.5
alpha = 1% or 0.01
z(alpha/2) = 2.58

error = 0.2 = z(alpha/2) * sd/ sqrt(n)
sqrt(n) = 2.576 * 2.5/0.2
n = 32.2^2 = 1036.85

therefore, sample should be 1036 OPTION B

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