Our colleague Dr. Fraudulus believes that red palm oil, due to its high content of vitamin A, will reduce the severity of ADHD symptoms for young children. To investigate whether this is indeed the case, a supplement will be prepared that contains either a placebo, a low dose, or a high dose of red palm oil. Because boys and girls may differ in ADHD symptoms and the response to the red palm oil supplement, we conduct a two-way ANOVA, that takes also gender into account. Suppose we recruit 75 boys and 75 girls to the study. We will then randomly assign 25 of each gender to each of the red palm oil dosage levels. What is/are the factor(s) for this study (check all that apply)? Dosage of red palm oil (high dose vs low dose vs placebo) Gender Whether Dr. Fraudulus went to a real medical school or not Level of ADHD symptoms

Our colleague Dr. Fraudulus believes that red palm oil, due to its high content of vitamin A, will reduce the severity of ADHD symptoms for young children. To investigate whether this is indeed the case, a supplement will be prepared that contains either a placebo, a low dose, or a high dose of red palm oil. Because boys and girls may differ in ADHD symptoms and the response to the red palm oil supplement, we conduct a two-way ANOVA, that takes also gender into account. Suppose we recruit 75 boys and 75 girls to the study. We will then randomly assign 25 of each gender to each of the red palm oil dosage levels. What is/are the factor(s) for this study (check all that apply)? Dosage of red palm oil (high dose vs low dose vs placebo) Gender Whether Dr. Fraudulus went to a real medical school or not Level of ADHD symptoms

Name: Our colleague Dr. Fraudulus believes that red palm oil, due to its hig
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Description: Our colleague Dr. Fraudulus believes that red palm oil, due to its high content of vitamin A, will reduce the severity of ADHD symptoms for young children. To investigate whether this is indeed the case, a supplement will be prepared that contains ei

College Algebra

1st Edition

ISBN:9781938168383

Author:Jay Abramson

Publisher:Jay Abramson

Chapter9: Sequences, Probability And Counting Theory

Section9.7: Probability

Problem 3SE: What is an experiment?

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What is an experiment?
The May 10, 2007 issue of The New England Journal of Medicine describes two large randomized, placebo-controlled trials of a vaccine for HPV-related cancer. HPV is human papillomavirus, the most common form of sexually transmitted infection. For the group of people who received the vaccine, the HPV-related cancer rate was much lower than for those who received a placebo. Which best describes the goal of this study?
The technology underlying hip replacements has changed as these operations havebecome more popular (over 250,000 in the United States in 2008). Starting in 2003,highly durable ceramic hips were marketed. Unfortunately, for too many patients theincreased durability has been counterbalanced by an increased incidence ofsqueaking. The May 11, 2008, issue of the New York Times reported that in one studyof 143 individuals who received ceramic hips between 2003 and 2005, 10 of the hipsdeveloped squeaking.a. Calculate a lower confidence bound at the 95% confidence level for the trueproportion of such hips that develop squeaking.b. Interpret the 95% confidence level used in (a).
Landolt et al. (A-26) examined rates of posttraumatic stress disorder (PTSD) in mothers and fathers. Parents were interviewed 5 to 6 weeks after an accident or a new diagnosis of cancer or diabetes mellitus type I for their child. Twenty-eight of the 175 fathers interviewed and 43 of the 180 mothers interviewed met the criteria for current PTSD. Is there sufficient evidence for us to conclude that fathers are less likely to develop PTSD than mothers when a child is traumatized by an accident, cancer diagnosis, or diabetes diagnosis? Let alpha = 0.05
If the results of a two-factor ANOVA show no main effect for factor A but show a significant interaction, then the results indicate that factor A has no effect on the subjects' scores. True or False
Think of a research scenario for which either 1-way or 2-way ANOVA would be needed to analyze the results.
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For part a), do we need to solve it with one-way anova or two-way anova?
A case-control study is planned to investigate whether bottle-fed infants are at increased risk of death from acute respiratory infections compared breast-fed infants. The mothers of a group of cases (infants' deaths, with an underlying respiratory cause named on the death certificate) will be interviewed about the breast-feeding status of the child prior to the illness leading to death. The results will be compared to with those obtained from mothers of a group of healthy controls regarding the current breast-feeding status of their infants. It is expected that about 40% of controls will be bottle-fed, and we would like to detect a difference if bottle-feeding was associated with a two-fold increase of death (OR-2). A. How many cases and controls need to be studied to give a 90% power of achieving 5% significance level. Copy and paste/print the answer from the software. B. Repeat part (A) if the OR was three-fold increase. What do you notice about the sample size needed? Explain
In a two-way ANOVA, the main effect of a factor is the A. extent to which the factor produces dependent variable scores different from those the other factor produced. B. effect that changing the levels of the factor has on the dependent variable, taking into account all other factors in the study. C. effect that changing the levels of the factor has on the dependent variable, ignoring all other factors in the study. D. extent to which its effect depends on the other factor.
How does alpha levels and signifigance allow researchers to generalize the larger population from their test samples?
In the context of a Two Factor ANOVA, should you proceed to an analysis of the main effects? Justify your answer. If you should, please indicate all the relevant null hypotheses and your conclusions.