Question: State the z-score used in constructing a confidence interval for a proportion with confidence level (a) 0.98, (b) 0.90, (c) 0.50, and (d) 0.9973.

State the z-score used in constructing a confidence interval for a proportion with confidence level

(a) 0.98,

(b) 0.90,

(c) 0.50, and

(d) 0.9973.

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