Prenatal vitamins and Autism. Researchers studying the link between prenatal vitamin use and autism surveyed the...

Prenatal vitamins and Autism. Researchers studying the link between prenatal vitamin use and autism surveyed the mothers of a random sample of children aged 24 - 60 months with autism and conducted another separate random sample for children with typical development. The table below shows the number of mothers in each group who did and did not use prenatal vitamins during the three months before pregnancy.

Prenatal Vitamin	Autism	Typical Development	Total
No vitamin	115	67	182
Vitamin	145	164	309
Total	260	231	491

Conduct the hypothesis test for the stated null and alternative. Use αα = K and round numeric answers to four decimal places.

H0H0: The variables use of prenatal vitamins during the three months before pregnancy and autism are independent.

HAHA: The variables use of prenatal vitamins during the three months before pregnancy and autism are not independent.

1. Enter the expected values for the hypothesis test in the table below, rounded to four decimal places.

Prenatal Vitamin	Autism	Typical Development
No vitamin
Vitamin

2. Calculate the test statistic for this hypothesis test. X2X2 =

3. Calculate the degrees of freedom for this hypothesis test.

4. Calculate the p-value for this hypothesis test. p-value =

5. What is your conclusion using αα = 0.01?

A. Reject H0H0
B. Do not reject H0H0

Solutions

Expert Solution

TS = 12.157

df = 1

p-value = =chisq.dist.rt(12.157,1) = 0.0005

we reject Ho

orchestra answered 1 year ago

Next > < Previous

Related Solutions

Researchers studying the link between prenatal vitamin use and autism surveyed the mothers of a random...

Researchers studying the link between prenatal vitamin use and autism surveyed the mothers of a random sample of children aged 24 - 60 months with autism and conducted another separate random sample for children with typical development. The table below shows the number of mothers in each group who did and did not use prenatal vitamins during the three months before pregnancy (periconceptional period). Researchers studying the link between prenatal vit (a) State appropriate hypotheses to test for independence of...

Researchers studying the link between prenatal vitamin use and autism surveyed the mothers of a random...

Researchers studying the link between prenatal vitamin use and autism surveyed the mothers of a random sample of children aged 24 - 60 months with autism and conducted another separate random sample for children with typical development. The table below shows the number of mothers in each group who did and did not use prenatal vitamins during the three months before pregnancy (periconceptional period). 1) Complete the hypothesis test and state an appropriate conclusion. Autism Typical Development TOTAL Periconceptual No...

Researchers studying the link between prenatal vitamin use and autism surveyed the mothers of a random...

Researchers studying the link between prenatal vitamin use and autism surveyed the mothers of a random sample of children aged 24 - 60 months with autism and conducted another separate random sample for children with typical development. The table below shows the number of mothers in each group who did and did not use prenatal vitamins during the three months before pregnancy (periconceptional period). 1) State appropriate hypotheses to test for independence of use of prenatal vitamins during the three...

Researchers at a hospital lab are studying the relationship between blood type and a type of...

Researchers at a hospital lab are studying the relationship between blood type and a type of surgical procedure. Typically, they hypothesize that distribution of blood type of people undergoing surgery should be similar to that of the population it serves. The distribution of the population that the hospital services is: 44% type O, 45% Type A, 8% Type B and 3% Type AB. They have blood type data on 187 patients who underwent the surgery at that hospital as follows:...

Researchers have been studying the association between cigarette smoking and caffeine intake and Parkinson's Disease for...

Researchers have been studying the association between cigarette smoking and caffeine intake and Parkinson's Disease for more than 40 years. The results of a study by Checkoway et al. (2002) follow: Ever having smoked cigarettes resulted with an odds ratio (OR) = 0.5 (95% confidence interval (CI): 0.4, 0.8). The OR for current smokers was OR = 0.3 (95% CI: 0.1, 0.7). Among ex-smokers the OR = 0.6 (95% CI: 0.4, 0.9). Interpret the three ORs (in your own words).

You were interested in examining the association between substance use and timing of first prenatal care...

You were interested in examining the association between substance use and timing of first prenatal care visit. You interviewed 1,500 women visiting MCV for their prenatal care visit. Of the women interviewed, 500 reported using illicit drugs. Only 50 reported their first prenatal care visit during the first trimester of pregnancy. Amoung the non drug users, 700 reported their first prenatal care visit during the first trimester of pregnancy. You analyzed the measure of association between substance use and timing...

Some individuals believe that there is a link between mobile phone use and brain tumors. The...

Some individuals believe that there is a link between mobile phone use and brain tumors. The basic idea is that mobile phones emit microwaves, and so holding one next to your brain for large parts of the day is a bit like sticking your brain in a microwave oven and selecting the ‘cook until well done’ button. (Please note: this claim has been refuted. But if it were supported, the study described below would not be a realistic or ethical...

Some individuals believe that there is a link between mobile phone use and brain tumors. The...

Although the studies explain the link between the use of social media and anxiety and depression...

Although the studies explain the link between the use of social media and anxiety and depression among adolescents, social media also help them connect, socialize, seek friendship, and support. Develop a possible solution that will help the adolescents to balance between the use of social media and their mental health

Stanford University medical researchers conducted a study on the correlation between the use of fertility drugs...

Stanford University medical researchers conducted a study on the correlation between the use of fertility drugs and ovarian cancer. Their study, published in the American Journal of Epidemiology, concludes that the use of the fertility drugs, Pergonal and Serophene, may increase the risk of ovarian cancer by three times. The lead author of the studies, Professor Alice Whittemore, stated, "Our finding in regard to fertility drugs is by no means certain. It is based on very small numbers and is...

Subjects