What is the z* critical value for constructing a 99% confidence interval for a proportion?Find the z-table here.

A 99% confidence interval leaves 1% outside the center, or 0.5% in each tail. The z-score with 0.995 of the area to its left is about 2.576, which rounds to 2.58. Therefore, the critical value is choice D, 2.58.

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