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Find the sample size necessary to construct a z-confidence interval at the given level of confidence, and within a given distance of the true population

Find the sample size necessary to construct a z-confidence interval at the given level of confidence, and within a given distance of the true population mean :

CL = 88%,? = 4, within 1 of the true population mean

Step 1: ? =

Step 2: ?/2 =

Step 3:

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