Fundamentals of Statistics (5th Edition)
5th Edition
ISBN: 9780134508306
Author: Michael Sullivan III
Publisher: PEARSON
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Chapter B.5, Problem 17AYU
To determine
To suggest: Whether the treatment groups have a higher standard for serum retinol concentration than the control group at
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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.
An experiment was conducted for better understanding of the effectiveness of a particular type of drug for reducing bad cholesterol (LDL) level. The purpose of the experiment was to determine whether different dosages used have significant different outcomes in average LDL reduction. Twenty subjects with LDL at around 250 to 300 mg/dL had participated in the study and were randomly divided into four groups. Each group was given a specific level of dosage of the drug each day for one month, with a control group that only provided with placebo. The reduction in LDL was recorded and showed in the following table. Positive number indicates reduction and negative numbers indicates increasing in DLD. Use statistical software to analyze the data and answer the following question.
Control
Light Dosage Level
Medium Dosage Level
Heavy Dosage Level
7
25
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-3
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Perform a One-way…
Kava is a beverage or extract that is made from Piper methysticum, a plant native to the western Pacific islands. Suppose that,
in a randomized comparative experiment to determine if taking kava daily can reduce insomnia, a group of participants with
insomnia were randomly assigned to take kava (treatment group) or a placebo (control group). After six weeks, the
participants were interviewed to see if they experienced a decrease in insomnia. The table shows the results from the sample.
The counts are the number of people in each group who experienced a decrease in insomnia.
Group
Description
Population
proportion
Sample size Sample count
Sample proportion
1
Treatment (kava)
P1
n₁ = 402
x1 = 213
P₁ = 0.5299
2 Control (placebo)
P2
n₂ = 521
x₂ = 121
P2 = 0.2322
Compute the standard error estimate, SE, of the difference in the sample proportions. Give your answer to at least four
decimal places.
0.0438
SE =
Incorrect
Determine the value of the two-sample z-statistic for the difference in…
Chapter B.5 Solutions
Fundamentals of Statistics (5th Edition)
Ch. B.5 - For Problems 18, find the critical value(s) for :...Ch. B.5 - For Problems 18, find the critical value(s) for :...Ch. B.5 - For Problems 18, find the critical value(s) for :...Ch. B.5 - For Problems 18, find the critical value(s) for :...Ch. B.5 - For Problems 18, find the critical value(s) for :...Ch. B.5 - For Problems 18, find the critical value(s) for :...Ch. B.5 - For Problems 18, find the critical value(s) for :...Ch. B.5 - For Problems 18, find the critical value(s) for :...Ch. B.5 - In Problems 914, assume that the populations are...Ch. B.5 - In Problems 914, assume that the populations are...
Ch. B.5 - In Problems 914, assume that the populations are...Ch. B.5 - In Problems 914, assume that the populations are...Ch. B.5 - In Problems 914, assume that the populations are...Ch. B.5 - In Problems 914, assume that the populations are...Ch. B.5 - Elapsed Time to Earn a Bachelors Degree Clifford...Ch. B.5 - Prob. 16AYUCh. B.5 - Prob. 17AYUCh. B.5 - SAT Test Scores A researcher wants to know if...Ch. B.5 - Waiting Time in Line McDonalds executives want to...Ch. B.5 - Filling Machines A quality-control engineer wants...Ch. B.5 - Rates of Returns of Stocks Stocks may be...Ch. B.5 - Measuring Reaction Time Researchers at the...
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