Which of the following statements is true regarding the width of a confidence interval for a population proportion? O a. It is wider for a sample of size 80 than for a sample of size 40. O b. It is wider for 95% confidence than for 99% confidence. O C. It is narrower when the sample proportion is 0.20 than when the sample proportion is 0.50. O d. It is narrower for 95% confidence than for 90% confidence.

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2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.