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

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

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Provide an appropriate response. Suppose you have obtained a confidence interval for u, but wish to obtain a greater degree of precision. Which of the following would result in a narrower confidence interval? L Increasing the sample size while keeping the confidence level fixed II. Decreasing the sample size while keeping the confidence level fixed III. Increasing the confidence level while keeping the sample size fixed IV. Decreasing the confidence level while keeping the sample size fixed O A. , IV O B. I, II OC. II, IV O D. II, II O E. II, IV