Problem #3: An observational study of Alzheimer's disease (AD) obtained data from 15 AD patients exhibiting moderatedementia and selected a group of 11 control individuals without AD. AD is a progressive neurodegenerativedisease of the elderly and advancing age is known to be a primary risk factor in AD diagnosis. Therefore, it wascrucial for the study's credibility to examine whether the ages in the AD group might be significantly differentthan in the control group. The ages of the subjects in years are summarized in the R Output below.Problem #3(b):Descriptive Statistics: Alzheimers, ControlVariable N N* Mean SE Mean StDev MinimumAlzheimers 15 0 78.781.75 6.76Control3.87 12.8211 0 66.54Problem #3(c):We want to test if the average age in the Alzheimer's group is significantly different than the control group.Assume that the populations are normal and that the population variances are not equal.(a) What is the null hypothesis?(b) Find the value of the test statistic.(c) Find the 5% critical value.(d) What is the conclusion of the hypothesis test?Problem #3(a): Select null hypothesisQ1 MedianQ3 Maximum77.00 79.25 87.00 92.2593.0054.00 56.00 65.00 82.00 89.00(A) Ho: M1 M2 (B) Ho: M1 M2 (C) Ho: M1 M2 (D) Ho: M122 (E) Ho: M1 M2 (F) Ho: M1 M2test statistic (correct to 3 decimals)critical value (correct to 3 decimals)

AlzheimersControlSample size 1511Sample mean 78.7866.54Sample standard deviation 6.7612.82The…

Answered: Problem #3: An observational study of…

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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For a two-factor ANOVA with two levels of factor A, two levels of factor B, and a separate sample of n = 5 participants in each treatment condition, the two means for level A1 are 6 and 8, and the two means for level A2 are 6 and 10. For these data, what is the value of SSB?
QUESTION 18 A researcher notes that there seems to be a difference in the prevalence of high blood pressure among college-educated individuals who consume low amounts of processed foods and the prevalence of individuals who only have a high school education and consume high amounts of processed foods. Use the appropriate hypothesis to test for the independence of the two independent variables presented here at the 5% significance level to ensure confounding has not influenced the study’s results. Then, interpret your response. Diet Low in Processed Foods Normal BP High BP Total College Education 124 55 179 High School Education 69 152 221 Total 193 207 400 Diet High in Processed Foods Normal BP High BP Total College Education 64 85 149 High School Education 98 153 251 Total 162 238 400 The chi square value of 37.724 is higher than the chi square value of 3.84; therefore, we do not reject H0 at the 5% level and reject H1, which states that level…
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NCI Cancer Bulletin, December 2, 2008 Volume 5 / Number 24 Title of the article: After Menopause, Weight Affects Breast Cancer Rates More than Mammography Use Women who are overweight or obese after menopause face an increased risk of breast cancer, but a large prospective cohort study indicates that the frequency of mammography use and screening accuracy are not the primary explanations for higher rates of breast cancer in these women. The same is true of large, invasive breast cancer tumors and advanced stage disease; risk increases with weight, but higher rates are not explained by the frequency or accuracy of screening mammography before breast cancer was diagnosed. The study appears in the December 3 Journal of the National Cancer Institute. Dr. Karla Kerlikowske of the San Francisco Veterans Affairs Medical Center and colleagues gathered data on 287,115 postmenopausal women who were registered in the Breast Cancer Surveillance Consortium database. Reflecting a trend in the…
You are concerned that nausea may be a side effect of Tamiflu, but you cannot just give Tamiflu to patients with the flu and say that nausea is a side effect if people become nauseous. This is because nausea is common for people who have the flu.Past studies state that about 33% of people who get the flu experience nausea. You collected data on 2248 patients who were taking Tamiflu to relieve symtoms of the flu, and found that 810 experienced nausea. You decide to carry out a simulation to test the claim that the percentage of people who take Tamiflu for the relief of flu symtoms and experience nausea is greater than 33%.a) Identify the null and alternative hypotheses.H0H0: ? p = p ≠ p < p > p ≤ p ≥ μ = μ ≠ μ < μ > μ ≤ μ ≥ H1H1: ? p = p ≠ p < p > p ≤ p ≥ μ = μ ≠ μ < μ > μ ≤ μ ≥
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