Question 14, 10.3.27 HW Score: 62.28%, 34.87 of 56 points (3) E Homework: Chapter 10 \"W ' Part2 of 3 ' 9 Points: 2.86 of5 Calcium is essential to tree growth because it promotes the formation of wood and maintains cell walls. In 1990, the concentration of calcium in precipitation in a certain area was 0.12 milligrams per liter (mg/L). A random sample of 10 precipitation dates in 2007 results in the following data table. Complete parts (a) through (c) below. E Click the icon to View the data table. (a) State the hypotheses for determining it the mean concentration of calcium precipitation has changed since 1990. H0: u = 0.1ng/L H1: p i 0.12mg/L (b) Construct a 90% condence interval about the sample mean concentration of calcium precipitation. The lower bound is The upper bound is (Round to four decimal places as needed.) Homework: Chapter 10 HW Question 19, 10.4.8 HW Score: 62.76%, 35.15 of 56 points Part 1 of 4 Points: 0.91 of 1 Save In 1945, an organization asked 1406 randomly sampled American citizens, "Do you think we can develop a way to protect ourselves from atomic bombs in case others tried to use them against us?" with 738 responding yes. Did a majority of the citizens feel the country could develop a way to protect itself from atomic bombs in 1945? Use the a = 0.1 level of significance. Click here to view the standard normal distribution table (page 1). Click here to view the standard normal distribution table (page 2). What are the null and alternative hypotheses? Ho: p = versus Hy: P > (Type integers or decimals. Do not round.) Determine the test statistic, zo. ZO= (Round to two decimal places as needed.) Determine the critical value(s). Select the correct choice below and fill in the answer box to complete your choice. (Round to two decimal places as needed.) A. The critical values are + B. The critical value isFor this question I need answer for part C & D. Homework: Chapter 10 HW Question 12, 10.3.13 HW Score: 61.14%, 34.24 of 56 points Part 3 of 5 Points: 3.67 of 4 Save A college entrance exam company determined that a score of 20 on the mathematics portion of the exam suggests that a student is ready for college-level mathematics. To achieve this goal, the company recommends that students take a core curriculum of math courses in high school. Suppose a random sample of 150 students who completed this core set of courses results in a mean math score of 20.7 on the college entrance exam with a standard deviation of 3.9. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 20 on the math portion of the exam? Complete parts a) through d) below. Click the icon to view the table of critical t-values. a) State the appropriate null and alternative hypotheses. Fill in the correct answers below. The appropriate null and alternative hypotheses are Ho: u = 20 versus H1: | > 20. b) Verify that the requirements to perform the test using the t-distribution are satisfied. Check all that apply. YA. The students were randomly sampled. Y B. The sample size is larger than 30. Y C. The students' test scores were independent of one another. D. None of the requirements are satisfied. c) Use the classical approach at the a =0.10 level of significance to find the critical value and test the hypotheses. Identify the test statistic. to = (Round to two decimal places as needed.) Identify the critical value. Select the correct choice below and fill in the answer box within your choice. (Round to two decimal places as needed.) A tor = B. tax/2= d) Write a conclusion based on the results. Choose the correct answer below. the null hypothesis and claim that there sufficient evidence to conclude that the population mean is than 20