What is the z* critical value for constructing a 90% confidence interval for a proportion?Find the z-table here.

A 90% confidence interval is two-sided, so 10% of the area is outside the interval, with 5% in each tail. The z-score with 95% of the area to its left is about 1.645, which rounds to 1.65. Thus, the correct choice is 1.65.

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