Question 17 18

Question 17 1 pts A simple random sample of size n is drawn from a population that is known to be normally distributed. The sample variance, s2, is determined to be 13.21. Construct and interpret a 90% confidence interval for o if the sample size, n, is 14. Show formula and final answer to two decimal places. Question 18 1 pts In 2000, 58% of females aged 15 and older lived alone, according to the U.S. Census Bureau. A sociologist tests whether this percentage is different today by conducting a random sample of 500 females aged 15 and older and finds that 285 are living alone. Is there sufficient evidence at the a - 0.1 level of significance to conclude the proportion has changed since 2000? Write both null and alternative. Indicate the tail. A) Ho: 0 = 0.58 H1:0 + 0.58 Two Tailed Test B) Ho: ut = 0.58 H1:M + 0.58 Two Tailed Test C) Ho: P = 0.58 H1: P 0.58 Right Tailed Test E) Ho: P - 0.58 H1: P + 0.58 Two Tailed Test Choose the correct answer from above