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Finding the critical value z* for a desired confidence level

AP.STATS: UNC‑4 (EU), UNC‑4.D (LO), UNC‑4.D.2 (EK)
You might need: Calculator,Z table

Problem

Emer made a one-sample z interval for a proportion and used the critical value z, start superscript, times, end superscript, equals, 1, point, 476.
What confidence level did she use?
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