8. idle employees. Suppose that the true proportion of registered voters who favor the Republican presidential candidate is 0.45. Find the mean and standard deviation of the sample proportion for samples of the following sizes. a. 17 = 30 b. n = 45 C. 17 - 65 d. What happens to the size of the standard deviation of the sample proportion as the sample size increases? 9. . Suppose that the true proportion of Americans over 25 years old that have a 4-year college degree is 0.35. Find the mean and the standard deviation of the sample proportion for samples of the following sizes. 38 b. 52 c. 1 = 75 d. What happens to the size of the standard deviation of the sample proportion as the sample size increases? 10. Suppose the true population proportion is p = 0.50. What is the probability that the sample proportion of a sample of size 20 will be greater than 0.60? 11. Suppose the true population proportion is p = 0.30. What is the probability that the sample proportion of a sample of size 30 will be less than 0.20