The reason we use a z-score from a normal distribution in constructing a confidence interval for a
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The reason we use a z-score from a normal distribution in constructing a confidence interval for a proportion is that
(a) For large random samples, the sampling distribution of the sample proportion is approximately normal.
(b) The population distribution is normal.
(c) For large random samples, the sample data distribution is approximately normal.
(d) If in doubt about the population distribution, it’s safest to assume that it is the normal distribution.
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