Question
In: Statistics and Probability
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 months before pregnancy and autism.
2) Complete the hypothesis test and state an appropriate conclusion.
3) 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 an alternative title.
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Solutions
orchestra answered 1 year agoRelated 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...
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...
15. As part of the Pew Internet and American Life Project, researchers surveyed a random sample...
15. As part of the Pew Internet and American Life Project,
researchers surveyed a random sample of 800 teens and a separate
random sample of 400 young adults. For the teens, 79% said that
they own an iPod or MP3 player. For the young adults, this figure
was 67%. Is there a significant difference between the population
proportions? State appropriate hypotheses for a significance test
to answer this question. Define any parameters you use.
17. Refer to Exercise 15.
a)....
Investigators studying exercise habits in different regions of the country surveyed a simple random sample of...
Investigators studying exercise habits in different regions of
the country surveyed a simple random sample of 421 California
adults, age 25 - 35, and an independent simple random sample of 377
Massachusetts adults, age 25 - 35.
Among other observations, the investigators noted that
(i) In the CA sample, the average number of hours/week of exercise
was 7.4, with a standard deviation of 3.3;
(ii) In the MA sample, the average number of hours/week of exercise
was 6.7, with a...
Investigators studying exercise habits in different regions of the country surveyed a simple random sample of...
Investigators studying exercise habits in different regions of
the country surveyed a simple random sample of 421 California
adults, age 25 - 35, and an independent simple random sample of 377
Massachusetts adults, age 25 - 35.
Among other observations, the investigators noted that
(i) In the CA sample, the average number of hours/week of
exercise was 7.4, with a standard deviation of 3.3;
(ii) In the MA sample, the average number of hours/week of
exercise was 6.7, with a...
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...
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