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Favorable Cases X = 23 Sample Size N = 100 The sample proportion is computed as follows, based on the sample size N = 100 and the number of favorable cases X = 23: X 23 100 - 0.23 N The critical value for a = 0.1 is ze = 21-a/2 = 1.645. The corresponding confidence interval is computed as shown below: P(1 - i) P(1 – Ô) CI(Proportion) р - Zc p+ zc n n = 0.23 - 1.645 x 0.23(1 – 0.23) 100 0.23 +1.645 x 0.23(1 – 0.23) 100 = (0.161,0.299)
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