Researchers studying the link between prenatal vitamin use and autism surveyed themothers of a random sample of children aged 24 - 60 months with autism and surveyedanother separate random sample for children with typical development.Table summarizing the number of mothers in each group who did and did not useprenatal vitamins during the three months before pregnancy (data from Schmidt, 2011)AutismTypical DevelopmentTotalNo vitamin11170181Vitamin143159302Total254229483Complete the hypothesis test for independence between the two variables, use of prenatalvitamins during the three months before pregnancy and autism in Rguroo.What is the value of the test statistic for this test? (Use the Large Sample Z method and pleaseround to two decimal places)

Answered: Researchers studying the link between…

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 study9 on the effects of AZT in slowing the development of AIDS symptoms, 338 veterans whose immune systems were beginning to falter after infection with the AIDS virus were randomly assigned either to receive AZT immediately or to wait until their T cells showed severe immune weakness. Output follows of modeling the 2 × 2 × 2 cross-classification of race, whether AZT was given immediately, and whether AIDS symptoms developed during the three-year study. What null hypothesis is tested by the difference between the null deviance and the residual deviance? Interpret. Explain how to set up indicator variables for azt and race to obtain the estimates shown.
Retinitis pigmentosa is a disease that manifests itself viadifferent genetic modes of inheritance. Cases have beendocumented with a dominant, recessive, and sex-linkedmode of inheritance. It has been conjectured that mode ofinheritance is related to the ethnic origin of the individual.Cases of the disease have been surveyed in an Englishand a Swiss population with the following results: Of 125English cases, 46 had sex-linked disease, 25 had recessive disease, and 54 had dominant disease. Of 110 Swisscases, 1 had sex-linked disease, 99 had recessive disease,and 10 had dominant disease. Do these data show a significant association between ethnic origin and genetic type?
The 5-year incidence of cardiovascular disease (CVD) in relation to smoking status was determined in a population sample of 1000 men, 18 years and older. At baseline, 30% of the men were classified as being current smokers and 70% as being non-smokers. At the end of the follow-up, 60 CVD events had occurred among the smokers and 70 events among the non-smokers. Construct a 2 x 2 table based on the data provided
The Joint Commission on Accreditation of Healthcare Organizations mandated that hospitals ban smoking by 1994. To study the effects of this ban on smoking behaviors, subjects were randomly selected from two different populations: those from hospitals with the ban and those from hospitals without the ban. Investigators were interested in determining if this smoking ban had any impact on the proportion of smokers employed at each hospital that then quit smoking. Let px be the proportion of smokers from hospitals that implemented the ban who quit smoking during the study period. Let py be the proportions of smokers from hospitals without the ban who quit smoking during the study period. Please select the appropriate hypotheses. H0: px = 0.50 HA: px ≠ 0.50 H0: px-py ≥ 0 HA: px-py H0: px-py ≤ 0 HA: px-py > 0 H0: px-py = 0 HA: px-py ≠ 0
Kuru is a prion disease of the Fore people of highland New Guinea. It was once transmitted by the consumption of deceased relatives at mortuary feasts, a ritual that was ended by about 1960. Using archived tissue samples, Mead et al. (2009) investigated genetic variants that might confer resistance to kuru. The data in the accompanying table are genotypes at codon 129 of the prion protein gene of young and elderly individuals all having the disease. Since the elderly individuals have survived long exposure to kuru, unusually common genotypes in this group might indicate resistant genotypes. b) Test whether genotype frequencies differ between the two age groups. Provide your answer below. (Your answer should include 1) null and alternative hypothesis, 2) degrees of freedom, 3) calculated chi-square value, 4) critical chi-square value (alpha=0.05) and 5) final biological conclusion)
Recently there has been quite a bit of controversy about the lack of definitive knowledge about the adverse side effects associated with hormone-based birth control usage. Suppose a researcher is interested in the effects of birth control in women aged 18-25 relevant to blood pressure. The researcher assumes that women in this demographic that are taking hormone-based birth control are at risk for increased blood pressure. Assume the following table contains the summary statistics of two SRSs, one from a cohort of women taking hormone-based birth control, and one from a cohort of women birth control free. Study Arm Average Systolic Blood Pressure (mmHG) Sample Standard Deviation Sample Size Birth Control 124 6.8 246 No Birth Control 116 4.3 267 Carry out the appropriate statistical procedure to determine if there is a significant difference in the systolic blood pressure between the two groups of women. Write out your null and alternative…
In clinical trails of Nasonex, 3774 adult and adolenscent allergy patients 12 years and older were randomly divided into two groups. The patient in group1 (experimental group) received 200 microgram of Nasonex, while the patient in group 2( control group) receiced a placebo. Of the 2103 patients in the experimental group 547 reported headaches as a side effect. Of the 1671 patients in the control group, 368 reported headaches as a side effect. Determine if the proportion of those taking Nasonex who experienced headaches as a side effect differs from that of those taking the placebo who experienced headaches as a side effect. A) state the null and alternative hypothese: B) construct a 95% confidence interval for the difference between these groups round to 4 places. Intervals: C)using intervals, state conclusion in the language of the problem.
Noting the paucity of information on the effect of estrogen on platelet membrane fatty acid composition, Ranganath et al. (A-48) conducted a study to examine the possibility that changes may be present in postmenopausal women and that these may be reversible with estrogen treatment. The 31 women recruited for the study had not menstruated for at least 3 months or had symptoms of the menopause. No woman was on any form of hormone replacement therapy (HRT) at the time she was recruited. Table 5 shows the platelet membrane linoleic acid values before and after a period of HRT. What is the t critical value? 4 decimal places
Noting the paucity of information on the effect of estrogen on platelet membrane fatty acid composition, Ranganath et al. (A-48) conducted a study to examine the possibility that changes may be present in postmenopausal women and that these may be reversible with estrogen treatment. The 31 women recruited for the study had not menstruated for at least 3 months or had symptoms of the menopause. No woman was on any form of hormone replacement therapy (HRT) at the time she was recruited. Table 5 shows the platelet membrane linoleic acid values before and after a period of HRT. Does the data follow normal distribution?
Noting the paucity of information on the effect of estrogen on platelet membrane fatty acid composition, Ranganath et al. (A-48) conducted a study to examine the possibility that changes may be present in postmenopausal women and that these may be reversible with estrogen treatment. The 31 women recruited for the study had not menstruated for at least 3 months or had symptoms of the menopause. No woman was on any form of hormone replacement therapy (HRT) at the time she was recruited. Table 5 shows the platelet membrane linoleic acid values before and after a period of HRT. What is the upper limit of CI? 4 decimal places
The article “Soft Drinks Consumption is Associated with Nonalcoholic Fatty Liver Disease Independent of Metabolic Syndrome in Chinese Population” (G. Meng, B. Zhang, et al., European Journal of Nutrition, 2017, online) presents the results of a study of soft drink and smoking habits in a sample of adults. Of 11,805 people who said they consume soft drinks weekly, 2527 said they were smokers. Of 14,985 who said they almost never consume soft drinks, 2503 were smokers. Find a 95% confidence interval for the difference between the proportions of smokers in the two groups.
In an experiment to examine the survival of eggs of the Pipevine swallowtail butterfly on its hostplant, Aristolocia californica, in gardens and in natural populations of the plant, a student located eggs masses at garden and natural sites, and also placed mesh bags around half of the egg masses sampled at each site to test for the effects of natural enemies (e.g., predators and parasites). Analyze the data contained in the data file “pipevine.csv”. State all the hypotheses you can test and report and interpret the test results. For sitetype 1 = garden and 0 = natural. pipevine data sitename bag unbag sitetype 1 26 0.95 0.67 0 2 9 0.69 0.60 1 3 18 0.88 0.58 0 4 28 0.85 0.44 0 5 40 0.96 0.61 0 6 37 0.65 0.65 1 7 43 0.65 0.00 1 8 36 0.81 0.48 1

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