Math 116

The large-sample confidence interval formula for proportions is valid if np ≥ 15 and n(1-p) ≥ 15. ... Now, we can compute the z-score and get z = (0.65 – 0.75) / 0.0433 = -2.31. Then, we use a z-table to find P(Z < -2.31) = 0.0104. 38. B Note that we are taking a random sample of 143 adult males. Since this sample size is larger than 30 ... ................
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