2. The following exercises are based on a study by Scholer et el. (1997). This wasa nested case-control study obtained from a cohort of children age 0 through 4years in Tennessee between January 1, 1991 and December 31, 1995. Casepatients consist of all cohort members who suffered injury deaths. Controlpatients were frequency matched to case patients by birth year. The variablesare;.PnclateByearinjflagbyearii)986987988989990991993994995CrudeM-H combinedIllegitcc injflag illegit, by (byear)= year of birth{a. The results below were obtained using the Mantel-Haenszel estimate of birth-year adjusted odds ratio for injury death among children with unmarriedmothers compared with those with married mothers. Note: the reference groupis married mothers.OR1.3660711.1713633.2924312.184272.5615022.4845562.4312032.9004581.894737Test of homogeneity (M-H)1: if subject died of injuries0: if such care was given, or if information is missing.1: if born out of wedlock-{2.2569932.2798160:otherwise,1: if no prenatal care was received in the first fourmonths of pregnancy0:otherwise.[95% Conf. Interval].6399061 2.796052.53605912.4393146.9643593.9176271.5790691.2098141.7669753.7155941.4310544.3413341.368645 4.3479541.528755.604574.67308935.3068531.8700881.895291chi2 (8)Test that combined OR = 1:2.7239882.7423568.22M-H Weight(.817391 (exact).181176 (exact)4.27451 (exact)8.005997 (exact)17.86557 (exact)3.693706 (exact)3.144118 (exact)6.122592 (exact)3.166667 (exact)Pr>chi2 = 0.4127Mantel-Haenszel chi2 (1) =Prochi279.340.0000(exact)Interpret the M-H combined adjusted odds ratio and test for significanceusing the confidence interval

The given summary table is displayed below. The objective is to interpret the M-H combined adjusted…

Answered: 2. The following exercises are based on…

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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A study compared tooth health and periodontal damage in a group of 40 young adult males with a tongue piercing and a control group of 50 young adult males without tongue piercing. Here are the summary statistics: Group Sample size Mean of enamel cracks StDev of enamel cracks Tongue piercing 40 4.1 3.7 No Tongue piercing 50 1.3 1.6 One question of interest was whether individuals with tongue piercing had more enamel cracks, on average. Is there evidence at 1% level that young adult males with a tongue piercing have significantly more enamel cracks than young adult males without a tongue piercing? Which method will you use to perform the test? Choose the correct one. 1-sample T test 2-sample T test 2-sample Z test. 2-proportion Z test Which distribution will you use here? If you use t distribution, give the degree of freedom. If you use z or normal, give the mean and standard deviation.
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A graduate student is interested in how viewing different types of scenes affects working memory. For his study, he selects a random sample of 36 adults. The subjects complete a series of working memory tests before and after walking in an urban setting. Before the walk, the mean score on the test of working memory was 9.1. After the walk, the mean score was 1.4 higher. The graduate student has no presupposed assumptions about how viewing different types of scenes affects working memory, so he formulates the null and alternative hypotheses as: H00 : μDD = 0 H11 : μDD ≠ 0 Assume that the data satisfy all of the required assumptions for a repeated-measures t test. The graduate student calculates the following statistics for his hypothesis test: Mean difference (MDD) 1.4 Estimated population standard deviation of the differences (s) 1.6 Estimated standard error of the mean differences (sMDMD) 0.2667 Degrees of freedom (df) 35 The t statistic 5.25 The critical values of t…
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Acne is a common skin disease that affects most adolescents and can continue into adulthood. A study compared the effectiveness of three acne treatments and a placebo, all in gel form, applied twice daily for 12 weeks. The study's 517 teenage volunteers were randomly assigned to one of the four treatments. Success was assessed as clear or almost clear skin at the end of the 12 week period. The results of the study can be seen in the table below. Using the appropriate statistical test, determine if there is significant evidence that the four treatments perform differently. If so, how do they compare.
Results on seat belt usage from the 2003 Youth Risk Behavior Survey were published in a USA Snapshot on January 13, 2005. The following table outlines the results from the high school students who were surveyed in the state of Nebraska. They were asked whether or not they rarely or never wear seat belts when riding in someone else's car. Using ? = .05, does this sample present sufficient evidence to reject the hypothesis that gender is independent of seat belt usage? Female Male Rarely or never use seat belt 206 323 Uses seat belt 1220 1157 (a) Find the test statistic. (Give your answer correct to two decimal places.)(ii) Find the p-value. (Give your answer bounds exactly.) ______< p < ________
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