In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 5000 subjects randomly selected from an online otological group (focused on ears), and 717 surveys were returned. Use the bootstrap method and the provided 200 bootstrap samples to construct a 99% confidenestimate of the proportion of returned surveys. How does this result compare to the 99% confidence interval estimate of 0.131

Bootstrap confidence interval The bootstrap is a method for estimating standard errors and…

Answered: a study of cell phone use and brain…

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 market survey was conducted to estimate the proportion of homemakers who wouldrecognize the brand name of a cleanser based on the shape and the color of the container.Of the 1,400 homemakers sampled, 420 were able to identify the brand by name. Develop a99 percent confidence interval for the population proportion.
A study of 420,035 cell phone users found that 0.0326% of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0331% for those not using cell phones. Complete parts (a) and (b).Question content area bottomPart 1a. Use the sample data to construct a 95% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system.enter your response here%<p<enter your response here%(Do not round until the final answer. Then round to three decimal places as needed.)Part 2b. Do cell phone users appear to have a rate of cancer of the brain or nervous system that is different from the rate of such cancer among those not using cell phones? Why or why not?A.Yes, because 0.0331% is not included in the confidence interval.B.Yes, because 0.0331% is included in the confidence interval.C.No, because 0.0331% is included in the confidence interval.D.No,…
In clinical trials of Nasonex, 750 randomly selected patients are randomly divided intotwo groups. The patients in group 1 receive Nasonex while the patients in group 2 receive a placebo. Of the 374 patients in the experimental group 120 reported experiencing a headache. Of the 376 patients in the control group, 64 reported experiencing a headache. Construct a 95% confidence interval estimate for the difference in the two population proportions.
During a period of 11 years 800800 of the people selected for grand jury duty were sampled, and 6262% of them were immigrants. Use the sample data to construct a 99% confidence interval estimate of the proportion of grand jury members who were immigrants. Given that among the people eligible for jury duty, 65.965.9% of them were immigrants, does it appear that the jury selection process was somehow biased against immigrants?
The fraction of defective integrated circuits produced in a photolithography process is being studied. A random sample of 300 circuits is tested, revealing 13 defectives. A 95% two-sided confidence interval on the fraction of defective circuits produced by this particular tool is closest to
A meta-analysis (Moore et al., Lancet 370: 319–328, 2007) of studies on the asso- ciation between cannabis use (yes, no) and presence of psychosis (yes, no) reported a pooled odds ratio estimate of 1.41, with 95% confidence interval of (1.20, 1.65). Explain how to interpret this interval.
The average height of all male students in ENG2015 in section A is 5 feet and 9 inches (or 175.26 centimeters). A sample of 18 male is selected, and their heights (in centimeters) are in the table below. Develop a 95% confidence interval to estimate the population mean.
In a randomised clinical trial to evaluate antibiotic treatment for possible occuit bacteremia, 500 children with fever were randomly assigned to the antibiotic or the placebo so that there were 250 in each group. Blood samples were cultured 48 hours after commencing therapy. The authors reported the proportions of children with major infectious morbidity were 13% in the placebo group and 10% in the antibiotic group. The 95% confidence interval for the difference in proportions was -2.6% to +8.6%. Choose the 95% confidence interval for the odds ratio that is most likely for these data if further analysis comparing the odds of major infectious morbidity in the treated group with the odds in the placebo group was conducted. O -0.423 to 1.275 O 0.423 to 1.275 O 0.423 to 0.875 O 1.275 to 1.423
Stainless steels can be susceptible to stress corrosion cracking under certain conditions. A materials engineer is interested in determining the proportion of steel alloy failures that are due to stress corrosion cracking. In the absence of preliminary data, what is the minimum sample size required to ensure a 95% confidence interval for p to within 0.02?
A greenhouse is growing a large number of poinsettia plants. An employee is monitoring their growth and selects 100 of them at random to measure. The plants have an average height of 5.5 inches, with an SD of 2 inches. Calculate a 90%-confidence interval for the average height of all the poinsettia plants growing in the greenhouse.
Unoccupied seats on flights cause airlines to lose revenue. Suppose a large airline wants to estimate its mean number of unoccupied seats per flight over the past year. To accomplish this, the records of 225 flights are randomly selected and the number of unoccupied seats is noted for each of the sampled flights. The sample mean is 11.6 seats and the sample standard deviation is 4.1 seats. Construct a 92% confidence interval for the population mean number of unoccupied seats per flight. (Round your answers to one decimal place.) margin of error E = Lower limit = Upper limit =
A study of 420,057 cell phone users found that 134 of them developed cancer of the brain or nervous system. Prior to this study of cell phone use, the rate of such cancer was found to be 0.0318% for those not using cell phones. Complete parts (a) and (b) a. Use the sample data to construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system. %

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