Question: 8.115 Multiple choice: Why z? The reason we use a z-score from a normal distribution in constructing a large-sample confidence interval for a proportion is

8.115 Multiple choice: Why z? The reason we use a z-score from a normal distribution in constructing a large-sample 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 data distribution is approximately normal.

d. For any n we use the t distribution to get a confidence interval, and for large n the t distribution looks like the standard normal distribution.

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