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Constructing a Confidence Interval for a Population Proportion

AP Statistics· difficulty 2/5

A 90% confidence interval is being constructed.

5% 5%

What is the critical value z*?

  • A

    1.282

  • B

    1.645

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  • C

    2.576

  • D

    1.96

Explanation

For 90% CI, z* leaves 5% in each tail. z* = 1.645.

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