6.28 Prenatal vitamins and Autism. Researchers studying the link between prenatal vitamin use andautism surveyed the mothers of a random sample of children aged 24 - 60 months with autism and conductedanother separate random sample for children with typical development. The table below shows the number ofmothers in each group who did and did not use prenatal vitamins during the three months before pregnancy(periconceptional period)."29AutismAutismTypical developmentTotalPericonceptional No vitaminprenatal vitamin11170181Vitamin143159302Total254229483(a) State appropriate hypotheses to test for independence of use of prenatal vitamins during the threemonths before pregnancy and autism.(b) Complete the hypothesis test and state an appropriate conclusion. (Reminder: Verify any necessaryconditions for the test.)(c) A New York Times article reporting on this study was titled "Prenatal Vitamins May Ward Off Autism".Do you find the title of this article to be appropriate? Explain your answer. Additionally, propose analternative title.30

Answered: Image /qna-images/answer/1962197d-75de-433d-bb72-6a11db1456e1.jpg

Answered: 6.28 Prenatal vitamins and Autism.…

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) and (b)
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.
A researcher is interested in seeing what effect a particular type of drug has on an intelligence test, depending on the time of day that the pill is administered. The researcher computes a two-way ANOVA and plots the resulting cell means on the graph at right. Assuming that any obvious differences are statistically significant Is there a main effect for type of pill? Is there a main effect for time of day? Is there an interaction? 4. Describe the findings of the study in everyday terms
Green Tea and Prostate Cancer A preliminary study suggests a benefit from green tea for those at risk of prostate cancer. The study involved 60 men with PIN lesions, some of which turn into prostate cancer. Half the men, randomly determined, were given 600 mg a day of a green tea extract while the other half were given a placebo. The study was double-blind, and the results after one year are shown in the table below. Treatment Cancer No Cancer Green Tea 1 29 Placebo 9 21 (a) Test at a 5% significant level to see if the sample provide evidence that taking green tea extract reduces the risk of developing prostate cancer. (b) Find 98% confidence interval for the difference between two population proportions of men with PIN lesions who get prostate cancer after taking green tea extract and after taking placebo for a year. Interpret the C.I. result.
1. A developmental psychologist would like to determine how much fine motor skill changes for children from age 3 to age 5. He takes a random sample of 9 three-year old children and gives each a manual dexterity test that measures fine motor skill. He tests these same children one and two years later, when they are each four- and five-years old. Higher scores on this test indicate better fine motor skills. Is there a significant difference in the motor skills at these ages? Test with an α = 0.01 and show ANOVA SPSS output.
c and d please
Impact of College Roommates on Grades In this exercise, we investigate answers to the questions: How much of an effect does your roommate have on your grades? In particular, does it matter whether your roommate brings a videogame to college? A study was conducted involving n = 210 first-year students who were randomly assigned a roommate. Table 1 gives summary statistics on grade point average (GPA) for the first semester depending on whether the student and/or the roommate brought a videogame to campus. Student brought videogame No Yes No Yes Roommate brought videogame No No Yes Yes Sample size 88 44 38 40 Mean GPA 3.128 3.039 2.932 2.754 Table 1 Videogames and GPA St. Dev. 0.590 0.689 0.699 0.639 Considering only students whose roommate does not bring a videogame to campus, find a 99% confidence interval for the difference in mean GPA between students who bring a videogame and those who do not bring a videogame μN - My, where μ represents the mean GPA for students who do not bring a…
what is the p value? is the p-value low? can we conclude?
A researchers is interested in the amount of sleep an individual receives after consuming a sleeping aid (Melatonin, Valerian root, and Placebo). The researcher randomly selects individuals into either group. However, some individuals drop out of the study which results in unequal sample sizes. Melatonin: n=6, M=14, T=84, SS=60 Valerian: n=10, M=13, T=130, SS=90 Placebo: n=4, M=9, T=36, SS=37 N=20, G=250, x2=3377 Calculate the F-ratio
6. A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo. Participants are randomly assigned to receive the new treatment or a placebo and the outcome is pain relief within 30 minutes. The data are shown in Table 7–54. Is there a significant difference in the proportions of patients reporting pain relief? Run the test at a 5% level of significance.
Use an ANOVA with ? = 0.05 to determine whether there are any significant differences among the three treatment means. If results are significant what is the effect size? Report results in APA format A developmental psychologist is examining the development of language skills from age 2 to 4. Three different groups are obtained, one for each age, with n = 16 children in each group. Each child is given a language-skills assessment test. The resulting data were analyzed with an ANOVA to test for mean differences between age groups. The results of the ANOVA are presented in the following table. Fill in all missing values. N = , n = , K = Source SS df MS F Between Txt 20 Within Txt Total 200

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