Which of the following statements are true? 1. When generating confidence interv

Question

Which of the following statements are true?

1. When generating confidence intervals and when doing significance tests we use the same expression for the standard error.

2. If zero is in the confidence interval for the difference between two proportions, we have evidence that the two population proportions could be the same.

3. When we do a significance test for the difference between two proportions, we're justified in pooling our estimates of the population proportion only if the sample sizes are large.

Select one:

a. I only

b. II only

c. III only

d. II and III only

e. I and III only

Explanation / Answer

If the confidence interval for the difference does not contain zero, we can conclude that there is a statistically significant difference in the two population values at the given level of confidence. This means statement II is true.

Statement 3 is not true completely, there are other condition which need to be fulfilled for pooling.

Hence only statement II is correct.

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