Q P mylab.pearson.com Raquel Sousa 05/08/24 12:07 PM Question 1, 10.3.13-T HW Score: 0%, 0 of 11 points Part 1 of 5 O Points: 0 of 1 Save A college entrance exam company determined that a score of 25 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 200 students who completed this core set of courses results in a mean math score of 25.3 on the college entrance exam with a standard deviation of 3.4. Do these results suggest that students who complete the core curriculum are ready for college-level mathematics? That is, are they scoring above 25 on the mathematics portion of the exam? Complete parts a) through d) below. a) State the appropriate null and alternative hypotheses. Fill in the correct answers below. The appropriate null and alternative hypotheses are Ho: versus H: Clear all Check answer 613 tv A MacBook ProRaquel Sousa 05/08/24 12:07 PM ? Question 2, 10.3.15-T HW Score: 0%, 0 of 11 points Part 1 of 4 O Points: 0 of 1 Save In a study, researchers wanted to measure the effect of alcohol on the hippocampal region, the portion of the brain K responsible for long-term memory storage, in adolescents. The researchers randomly selected 14 adolescents with alcohol use disorders to determine whether the hippocampal volumes in the alcoholic adolescents were less than the normal volume of 9.02 cm . An analysis of the sample data revealed that the hippocampal volume is approximately normal with no outliers and x = 8.03 cm and s =0.8 cm . Conduct the appropriate test at the a = 0.01 level of significance. State the null and alternative hypotheses. Ho: MV (Type integers or decimals. Do not round.) book Clear all Check answer tv A MacBook ProRaquel Sousa 05/08/24 12:07 PM ? Question 3, 10.3.17-T HW Score: 0%, 0 of 11 points Part 1 of 4 Points: 0 of 1 Save Next question A credit score is used by credit agencies (such as mortgage companies and banks) to assess the creditworthiness of individuals. Values range from 300 to 850, with a credit score over 700 considered to be a quality credit risk. According to a survey, the mean credit score is 704.1. A credit analyst wondered whether high-income individuals (incomes in excess of $100,000 per year) had higher credit scores. He obtained a random sample of 44 high-income individuals and found the sample mean credit score to be 720.7 with a standard deviation of 82.2. Conduct the appropriate test to determine if high-income individuals have higher credit scores at the a = 0.05 level of significance. State the null and alternative hypotheses. Ho : HV (Type integers or decimals. Do not round.) ook Clear all Check answer tv A MacBook ProRaquel Sousa 05/08/24 12:07 PM ? Question 4, 10.3.18-T HW Score: 0%, 0 of 11 points Part 1 of 4 O Points: 0 of 1 Save Next question It has long been stated that the mean temperature of humans is 98.6 F. However, two researchers currently involved in the subject thought that the mean temperature of humans is less than 98.6 F. They measured the temperatures of 44 healthy adults 1 to 4 times daily for 3 days, obtaining 200 measurements. The sample data resulted in a sample mean of 98.4'F and a sample standard deviation of 1.1 F. Use the P-value approach to conduct a hypothesis test to judge whether the mean temperature of humans is less than 98.6 F at the or = 0.01 level of significance. State the hypotheses. Ho: 98.6 F 98.6 F book Clear all Check answer A MacBook Pro DIIRaquel Sousa 05/08/24 12:08 PM Question 5, 10.3.25-T HW Score: 0%, 0 of 11 points Part 1 of 4 Points: 0 of 1 Save Next question Calcium is essential to tree growth. In 1990, the concentration of calcium in precipitation in Chautauqua, New York, was 0.11 milligram per liter mg A random sample of 8 precipitation dates in 2018 results in the following data: 0.087 0.313 0.183 0.070 0. 108 0.120 0.262 0.065 A normal probability plot suggests the data could come from a population that is normally distributed. A boxplot does not show any outliers. Does the sample evidence suggest that calcium concentrations have changed since 1990Use the a = 0.05 level of significance. What are the null and alternative hypotheses? Ho: (Type integers or decimals. Do not round.) ok Clear all Check answer "tv A MacBook Pro DIL DD F5Raquel Sousa 05/08/24 12:08 PM ? Question 6, 10.3.29-T HW Score: 0%, 0 of 11 points Part 1 of 3 O Points: 0 of 1 Save Next question Calcium is essential to tree growth. In 1990, the concentration of calcium in precipitation in a certain area was 0.15 milligrams per liter mg A random sample of 10 precipitation dates in 2018 results in the following data table. Complete parts (a) through (c) below. Click the icon to view the data table. (a) State the hypotheses for determining if the mean concentration of calcium precipitation has changed since 1990. Ho 0.15 mg/L Hy |0.15 mg/L OK Clear all Check answer City A MacBook Pro DII DO F5Raquel Sousa 05/08/24 12:08 PM ? Question 7, 10.3.31-T HW Score: 0%, 0 of 11 points Part 1 of 3 Points: 0 of 1 Save Next question The average daily volume of a computer stock in 2011 was u = 35.1 million shares, according to a reliable source. A stock analyst believes that the stock volume in 2018 is different from the 2011 level. Based on a random sample of 30 trading days in 2018, he finds the sample mean to be 30.2 million shares, with a standard deviation of s = 12.3 million shares. Test the hypotheses by constructing a 95% confidence interval. Complete parts (a) through (c) below. (a) State the hypotheses for the test. Ho 35.1 million shares V 35.1 million shares bok Clear all Check answer A MacBook Pro DII DDRaquel Sousa 05/08/24 12:08 PM Question 8, 10.3.33-T HW Score: 0%, 0 of 11 points Part 1 of 9 O Points: 0 of 1 Save Next question A math teacher claims that she has developed a review course that increases the scores of students on the math portion of a college entrance exam. Based on data from the administrator of the exam, scores are normally distributed with u = 515. The teacher obtains a random sample of 1800 students, puts them through the review class, and finds that the mean math score of the 1800 students is 521 with a standard deviation of 111. Complete parts (a) through (d) below. (a) State the null and alternative hypotheses. Ho: ok Clear all Check answer 4 MacBook Pro DII DD F11 F9 F10 F6 F7 F8Raquel Sousa 05/08/24 12:08 PM ? Question 9, 10.3.36-T HW Score: 0%, 0 of 11 points Part 1 of 13 O Points: 0 of 1 Save Next question Suppose the mean IQ score of people in a certain country is 101. Suppose the director of a college obtains a simple random sample of 40 students from that country and finds the mean IQ is 104.9 with a standard deviation of 13.7. Complete parts (a) through (d) below. (a) Consider the hypotheses Ho: H - 101 versus H1: u > 101. Explain what the director is testing. Perform the test at the a = 0.05 level of significance. Write a conclusion for the test. Explain what the director is testing. Choose the correct answer below. O A. The director is testing if the sample provided sufficient evidence that the population mean IQ score is actually greater than 101. B. The director is testing if the sample provided sufficient evidence that the population mean IQ score is actually not greater than 101. O C. The director is testing if the sample provided sufficient evidence that the population mean IQ score is actually equal to 101. O D. The director is testing if the sample provided sufficient evidence that the population mean IQ score is actually not equal to 101. ok Clear all Check answer tv 4 MacBook Pro DII DD F11 F5 F6 F7 F8 F9 F 10Raquel Sousa 05/08/24 12:08 PM ? Question 10, 10.3.36-T HW Score: 0%, 0 of 11 points Part 1 of 13 O Points: 0 of 1 Save Next question Suppose the mean IQ score of people in a certain country is 101. Suppose the director of a college obtains a simple random sample of 40 students from that country and finds the mean IQ is 104.9 with a standard deviation of 13.7. Complete parts (a) through (d) below. (a) Consider the hypotheses Ho: H # 101 versus H1: u > 101. Explain what the director is testing. Perform the test at the a = 0.05 level of significance. Write a conclusion for the test. Explain what the director is testing. Choose the correct answer below. A. The director is testing if the sample provided sufficient evidence that the population mean IQ score is actually greater than 101. O B. The director is testing if the sample provided sufficient evidence that the population mean IQ score is actually not greater than 101. O C. The director is testing if the sample provided sufficient evidence that the population mean IQ score is actually equal to 101. O D. The director is testing if the sample provided sufficient evidence that the population mean IQ score is actually not equal to 101. ok Clear all Check answer tv MacBook Pro DII DD F11 F5 F7 F8 F9 F10 F608/24 12:08 PM Question 11, 10.3.X1-T HW Score: 0%, 0 of 11 points Part 1 of 4 Points: 0 of 1 Save Next question A golf association requires that golf balls have a diameter that is 1.68 inches. To determine if golf balls conform to the standard, a random sample of golf balls was selected. Their diameters are shown in the accompanying data table. Do the golf balls conform to the standards? Use the a = 0.01 level of significance. Click the icon to view the data table. First determine the appropriate hypotheses. Ho: Hy V (Type integers or decimals. Do not round.) Clear all Check answer itv A MacBook Pro DII DD F8 F9 F11 F7 F10 F5 F6