5. Bone mineral density (BMD) is a measure of bone strength. It is defined as the ratio of bone mass to the cross-sectional area of the bone that is scanned, and it is expressed in units of grams per square centimeter (g/cm²).Recent studies suggest that peak BMD in women is achieved between ages 15 and 40, and BMD declines afterage 45. Decreased BMD is associated with increased risk of bone fracture.In a recent study, the impact of regular physical exercise on women in differing stages of BMD developmentwas examined. A simple random sample of 59 women between the ages of 41 and 45 and with no major healthproblems were enrolled in the study. The women were classified into one of the two following groups, based ontheir level of exercise activity.• Sedentary: minimal participation in physical exercise in the past three years (This group contained31 women.)• Walkers: walk at an aerobic pace at least 135 minutes per week during the past three years (This groupcontained 28 women.)(a) The table below shows the mean BMD and corresponding standard deviation for each of the two groupsof women.Exercise GroupSedentaryWalkersNumber of Women3128Mean BMD1.1511.209Standard Deviation0.0680.067A t-test was conducted to compare the mean BMD levels for sedentary women and walkers. The resultsof the test showed a significant difference at the 0.01 level of significance. Based on the results, can it beconcluded that converting sedentary women into walkers would necessarily increase their BMD levels?Explain.

Answered: Image /qna-images/answer/e5c349a6-85cf-45de-8dfb-b0bb56ba8136.jpg

Answered: (a) The table below shows the mean BMD…

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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In a test of the effectiveness of garlic for lowering cholesterol, 49 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.8 and a standard deviation of 15.5. Use a 0.01 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlic treatment? Assume that a simple random sample has been selected. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim.
In a test of the effectiveness of garlic for lowering cholesterol, 49 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.1 and a standard deviation of 1.93. Use a 0.10 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlic treatment? Assume that a simple random sample has been selected. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim. What are the null and alternative hypotheses? O A. Ho: H=0 mg/dL O B. Ho: H=0 mg/dL H1: µ#0 mg/dL H1:H>0 mg/dL OC. Ho: H>0 mg/dL H1:H<0 mg/dL O D. Ho: H=0 mg/dL H1:H<0 mg/dL Determine the test statistic, O (Round to two decimal places as needed.) Determine the P-value. (Round to three decimal…
In a test of the effectiveness of garlic for lowering cholesterol, 36 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.7 and a standard deviation of 2.03. Use a 0.01 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlic treatment? Assume that a simple random sample has been selected. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim.
A random sample of 75 medical doctors in Detroit showed that they worked an average of 55.1 hours/week with a standard deviation of 7.2 hours/week. A random sample of 75 medical doctors in Cleveland worked an average of 61 hours/week with a standard deviation of 7.9 hours/week. Is there is difference in the mean number of hours worked for the two cities? What is the appropriate test to answer this question? A Paired Samples t test B Correlation C Chi Square test D Independent Samples t test
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Consider the following sample data. Sample A: Sample B: Sample C: 10, 20, 30 80, 90, 100 1,095; 1,105; 1,115 (a) Find the mean and standard deviation for each sample. Sample A: Sample B: Sample C: Mean Sample Standard Deviation (b) What does this exercise show about the standard deviation? O The idea is to illustrate that the standard devlation is not a function of the value of the mean. O The idea is to illustrate that the standard devlation is a function of the value of the mean.
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7.40 Student performance across discussion sections. A professor who teaches a large introductory statistics class (197 students) with eight discussion sections would like to test if student performance differs by discussion section, where each discussion section has a different teaching assistant. The summary table below shows the average final exam score for each discussion section as well as the standard deviation of scores and the number of students in each section. Sec 1 Sec 2 Sec 3 Sec 4 Sec 5 Sec 6 Sec 7 Sec 8 ni 33 19 10 29 33 10 32 31 92.94 91.11 91.80 92.45 89.30 88.30 90.12 93.35 Si 4.21 5.58 3.43 5.92 9.32 7.27 6.93 4.57 The ANOVA output below can be used to test for differences between the average scores from the different discussion sections. F value Pr(>F) 0.0767 Df Sum Sq Mean Sq section 7 525.01 75.00 1.87 Residuals 189 7584.11 40.13 Conduct a hypothesis test to determine if these data provide convincing evidence that the average score varies across some (or all)…
In a test of the effectiveness of garlic for lowering cholesterol, 36 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.1 and a standard deviation of 21.2. Use a 0.01 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlic treatment? Assume that a simple random sample has been selected. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim. What are the null and alternative hypotheses? B. Ho: μ=0 mg/dL ⒸA. Ho: μ = 0 mg/dL H₁: μ#0 mg/dL H₁: μ 0 mg/dL H₁: μ> 0 mg/dL H₁: <0 mg/dL Determine the test statistic. (Round to two decimal places as needed.) Determine the P-value. (Round to three decimal places as needed.)
In a test of the effectiveness of garlic for lowering cholesterol, 36 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.6 and a standard deviation of 1.54. Use a 0.10 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlic treatment? Assume that a simple random sample has been selected. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim.
In a test of the effectiveness of garlic for lowering cholesterol, 36 subjects were treated with raw garlic. Cholesterol levels were measured before and after the treatment. The changes (before minus after) in their levels of LDL cholesterol (in mg/dL) have a mean of 0.7 and a standard deviation of 23.1. Use a 0.01 significance level to test the claim that with garlic treatment, the mean change in LDL cholesterol is greater than 0. What do the results suggest about the effectiveness of the garlic treatment? Assume that a simple random sample has been selected. Identify the null and alternative hypotheses, test statistic, P-value, and state the final conclusion that addresses the original claim.

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