What is the z* critical value for constructing an 88% confidence interval for a proportion?Find the z-table here.

An 88% confidence interval leaves 12% outside the middle area, or 6% in each tail. The cumulative area to the left of the positive critical value is therefore 0.88 + 0.06 = 0.94. The z-value for a cumulative area of 0.94 is about 1.55, so the critical value is 1.55.

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