Why do we need to take preliminary sample

Reference no: EM13285859

Why do we need to take a preliminary sample when determining the size of the sample needed to make the margin of error of a confidence interval equal to E?

Reference no: EM13285859

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Why do we need to take preliminary sample : Why do we need to take a preliminary sample when determining the size of the sample needed to make the margin of error of a confidence interval equal to E?

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