ps/assessment/take/launch.jsp?course_assessment_id%3D_442215 1&course_id=_3645813_1&content_id%3D 8105255 18&steQuestion ompletion Status:QUESTION 43A researchers used school records to determine that, in one school district, 84% of children whose parent were religiouswere vaccinated, while 64% of children whose parents were not religious were vaccinated.What is the explanatory variable here?School RecordsO Parent's religiosityO VaccinationO None of these is correct.QUESTION 44The National Center for Health Statistics has founc that there is a 5.019 chance that an American citizen will die from anrddent (unintentional injury).what is the probability that you will not die from an accident? (Round to the nearest

Answered: QUESTION 43 A researchers used school…

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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7 How many degrees of freedom (df) are associated with two different samples, 15 participants in each sample for a study investigating the effects of illumination of productivity under two treatment conditions?
The Department of Natural Resources (DNR) received a complaint from recreational fishermen that a community was releasing sewage into the river where they fished. These types of releases lower the level of dissolved oxygen in the river and hence cause damage to the fish residing in the river. An inspector from the DNR designs a study to investigate the fishermen’s claim. Fifteen water samples are selected at locations on the river upstream from the community and fifteen samples are selected downstream from the community. The dissolved oxygen readings in parts per million (ppm) are given in the following table.Upstream 5.2 4.8 5.1 5.0 4.9 4.8 5.0 4.7 4.7 5.0 4.6 5.2 5.0 4.9 4.7, Downstream 3.2 3.4 3.7 3.9 3.6 3.8 3.9 3.6 4.1 3.3 4.5 3.7 3.9 3.8 3.7 a.In order for the discharge to have an impact on fish health, there needs to be at least a 0.5 ppm reduction in the dissolved oxygen. Do the data provide sufficient evidence that there is a large enough reduction in the mean dissolved oxygen…
Two types of valves are being tested to determine if there is a difference inpressure tolerances. Fifteen out of a random sample of 100 of Valve Acracked under 4,500 psi. Six out of a random sample of 100 of Valve Bcracked under 4,500 psi. Test at a 5% level of significance.
Ariatnam, Najafi, and Morones (Journal of professional Issues in Engineering Education andPractice, 2002) describe an overview of academies in horizontal directional drilling conducted totrain engineers and inspector for the California Department of Transportation. A pretest wasadministered on the first day prior to any instruction. Instruction and field experience wereprovided over a 3 day period, followed by a final test administered at the end of the last day.Although the average final test score of 75.27% was higher than the average pretest score of55.61%, the difference was not significant.a. Identify the type of the study described here.b. What is the purpose of administering the pretest?
Two types of valves are being tested to determine if there is a difference in pressure tolerances. Fifteen out of a random sample of 100 of Valve A cracked under 4,500 psi. Six out of a random sample of 100 of Valve B cracked under 4,500 psi. Test at a 5% level of significance
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Angioplasty is a medical procedure in which an obstructed blood vessel is widened. In some cases, a wire mesh tube, called a stent, is placed in the vessel to help it remain open. The article “Long-term Outcomes of Patients Receiving Drug-eluting Stents” (A. Philpott, D. Southern, et al., Canadian Medical Association Journal, 2009:167–174) presents the results of a study comparing the effectiveness of a bare metal stent with one that that has been coated with a drug designed to prevent reblocking of the vessel. A total of 5320 patients received bare metal stents, and of these, 841 needed treatment for reblocking within a year. A total of 1120 received drug coated stents, and 134 of them required treatment within a year. a) Find a 98% confidence interval for the differences between the proportions for drug coated stents and bare metal stents. b) Suppose that additional patients are to be treated in order to increase the precision of the confidence interval. Three sampling plans are…
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Is there a treatment that appears to be most effective in the sandy and dry region?

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