27. Suppose X is unimodal and symmetric with mean 10 and standard deviation 1. Answer the following questions with the help of Figure 7.7. Figure 7.7: The Empirical Rule (a) Approximately, what percent of observa- tions are between 9 and 11? (b) Approximately, what percent of observa- tions are between 9 and 12? (c) Approximately what percent of observa- tions are less than 9? (d) Approximately what percent of observa- tions are greater than 13? (e) What is the 84th percentile for X? X: 7 (f) What is the 16th percentile for X? 10 11 12 13 Z: -3 -2 -1 3

27. Suppose X is unimodal and symmetric with mean 10 and standard deviation 1. Answer the following questions with the help of Figure 7.7. Figure 7.7: The Empirical Rule (a) Approximately, what percent of observa- tions are between 9 and 11? (b) Approximately, what percent of observa- tions are between 9 and 12? (c) Approximately what percent of observa- tions are less than 9? (d) Approximately what percent of observa- tions are greater than 13? (e) What is the 84th percentile for X? X: 7 (f) What is the 16th percentile for X? 10 11 12 13 Z: -3 -2 -1 3

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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QUESTION 11 Assume that the population proportion is 0.48. Compute the standard error of the proportion, σp, for sample sizes of 500,000; 1,000,000; 5,000,000; 10,000,000; and 100,000,000. (Round your answers to five decimal places.) sample size of 500,000sample size of 1,000,000sample size of 5,000,000sample size of 10,000,000sample size of 100,000,000 What can you say about the size of the standard error of the sample proportion as the sample size is increased? The standard error of the sample proportion, σp, ---Select--- increases decreases and becomes extremely ---Select--- small large as the sample size becomes huge.
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