Rescarch has shown that specific biochemical markers are found exclusively in the breath of patients with lung cancer, However,no lab test can currently distinguish the breath of lung cancer patients from that of other subjects. Could dogs be trained toidentify these markers in specimens of human breath, as they can be to detect illegal substances or to follow a person's scent? Anexperiment traincd dogs to distinguish breath specimens of lung cancer patients from breath specimens of control individuals byusing a food-reward training method. After the training was complete, the dogs were tested on new breath specimens without anyreward or clue using a double-blind, completely randomized design. The results for a random sample of 1291 breath specimensare provided.Note: The numerical values in this problem have been modified for testing purposes.Breath SpecimenCancer SubjectDog Test ResultNegativeControl SubjectTotal71510725Positive562566Total7195721291(a) The sensitivity of a diagnostic test is its ability to correctly give a positive result when a person tested has the discase, orP(positive test | discase). Find the sensitivity of the dog cancer-detection test for lung cancer. Give your answer to fourdecimal places.P(positive test | discase) =

Statisticians use the concept of conditional probability to obtain the sensitivity of a diagnostic…

Answered: Rescarch has shown that specific…

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 researcher is interested in estimating the extent to which posting caloric labels on menus changes the number of calories consumed by patrons. To test the impact of posting caloric labels on menu items, the analyst created two menus for the same restaurant: One menu with caloric labels and one menu without. As soon as restaurant guests entered the restaurant, they were randomly assigned one of the two types of menus. For the sake of clarity, guests assigned the menu with caloric labels are referred to as “Group 1” or the “treatment group”. Likewise, guests assigned the menu without caloric labels are referred to as “Group 2” or the control group. The analyst then collected data detailing how many calories each guest consumed as well as recording the age of each guest. The variable Cal1 denotes the number of calories consumed by guests who were assigned to the treatment group 1, while the variable Cal2 denotes the number of calories consumed by guests who were assigned to the control…
A researcher wants to determine if there is a significant difference in the number of times a new treatment for a medical condition results in relief from symptoms compared to the standard treatment. They randomly assign 20 patients to receive the new treatment and 20 to receive the standard treatment, and record the number of times each patient experienced relief from symptoms in a given period of time. The researcher uses the Wilcoxon Signed-Ranks Test to analyze the data. What is the null hypothesis for this test?
Wertheretal et al. examined the β-leucocyte count (/ L) in 51subjects with colorectal cancer and 19 healthy controls. The cancer patients were also classified into Dukes’s classification (A,B,C) for colorectal cancer that gives doctors a guide to the risk, following surgery, of cancer coming back or spreading to other parts of the body. An additional category (D) identified patients with disease that had not been completely resected. The results are displayed in the following table. Perform an analysis of these data in which you identify the sources of variability and specify the degrees of freedom for each. Do these data provide sufficient evidence to indicate that, on average, leucocyte counts differ among the five categories? Let α=0.01 . Write the null and alternative hypotheses of this study. Test the claim using the ANOVA Table. If you reject the null hypothesis, interpret your results using multiple comparison test Bonferroni. What assumptions must be made in part (b)? Are they…
Chocolate contains caffeine and an endogenous cannabinoid, as well as a chemical thatmodulates serotonin production; but is it an aphrodisiac, as the Mayans and Aztecs believed?Suppose you conduct a study which measures sex drive in a group of 20 women, after eating 8ounces of chocolate. Given that you have available data from the Kinsey Institute (IndianaUniversity) about the general sex drive for women of the same demographic as in your study, youdecide to compare your group to this population estimate.If testing hypotheses about the effects of chocolate on sex drive, it would be most appropriate tocalculate a ...1)Paired sampled t2)Z-test3)Independent-samples t-test 4)One- sample t-test
A study of 6600 men found that those who consumed a moderate amount of alcohol (one drink or less per night ) have lower mortality(on the average ) than Thoose who drink none is the is this good evidence that drinking a moderate amount causes lower mortality? A) yes because the study is an experiment B) no becuase who drink a moderate amount may differ from nodeinkers in other ways such as income and exercise that affect mortality c) no because we can't generalize from 6600 people to the millions of adults in the country D) yes because the sample is so large that the margin of error will be quite small
A researcher is conducting a study on the palliative care of patients at a specific facility to determine how their chronic pain symptoms change after entering the palliative care environment. This study is aimed at determining the effectiveness of a standardized treatment protocol for the patients entering into the palliative care environment. To do this, the researcher is comparing the pain scores of individuals before treatment and after treatment. Set up a Wilcoxon signed-ranks test and interpret it at the alpha equals .05 level. Patient Before Treatment After Treatment Value of Differences Ordered Absolute Values of Differences Ranks Sign Rank 1 9 4 5 1 -1 -1 2 10 5 5 2 2 +2 3 7 3 4 3 3 +3 4 8 5 3 4 5 +5 5 6 7 -1 4 5 +5 6 9 5 4 4 5 +5 7 6 4 2 5 8 +8 8 7 3 4 5 8 +8 9 9 4 5 5 8 +8 We reject H0 in favor of H1, which…
A researcher is conducting a study on the palliative care of patients at a specific facility to determine how their chronic pain symptoms change after entering the palliative care environment. This study is aimed at determining the effectiveness of a standardized treatment protocol for the patients entering into the palliative care environment. To do this, the researcher is comparing the pain scores of individuals before treatment and after treatment. Set up a Wilcoxon signed-ranks test and interpret it at the alpha equals .05 level. Patient Before Treatment After Treatment Value of Differences Ordered Absolute Values of Differences Ranks Sign Rank 1 9 4 2 10 5 3 7 3 4 8 5 5 6 7 6 9 5 7 6 4 8 7 3 9 9 4 A) We fail to reject H0, which states the median…
A researcher is conducting a study on the palliative care of patients at a specific facility to determine how their chronic pain symptoms change after entering the palliative care environment. This study is aimed at determining the effectiveness of a standardized treatment protocol for the patients entering into the palliative care environment. To do this, the researcher is comparing the pain scores of individuals before treatment and after treatment. Set up a Wilcoxon signed-ranks test and interpret it at the alpha equals .05 level. Patient Before Treatment After Treatment Value of Differences Ordered Absolute Values of Differences Ranks Sign Rank 1 9 4 2 10 5 3 7 3 4 8 5 5 6 7 6 9 5 7 6 4 8 7 3 9 9 4 A) We fail to reject H0, which states the median…
A study was conducted that investigated the gene ACTN3, which encodes a protein that functions in fast-twitch muscle fibres. People can be classified according to which genotype of this gene they have, RR, RX or XX. The study included a sample of elite sprinters and a sample of endurance athletes. The researchers are investigating whether there is an association between the genotype classification and the type of athlete (sprinters or endurance). What is the null and alternative hypotheses for the test?
In recent years, concerns have been expressed about adverse health effects from amalgam dental restorations, which include mercury. The table below shows results from a study in which some patients were treated with amalgam restorations and others were treated with composite restorations that do not contain mercury (based on data from “Neuropsychological and Renal Effects of Dental Amalgam in Children,” by Bellinger, et al., Journal of the American Medical Association, Vol. 295, No. 15). Use a 0.05 significance level to test for independence between the type of restoration and sensory disorders. Do amalgam restorations appear to affect sensory disorders? Amalgam Composite Sensory disorder 36 28 No sensory disorder 231 239
A market researcher claims that the purchases for a particular gift item are men, 50 percent; women, 40 percent; and children under 18, 10 percent. The researcher takes a sample in a very large department store and finds in a given week that 43 items were purchased by men, 33 by women, and 4 by children under 18. Does the evidence support the claim of the market researcher? Use alpha = 0.05
This is the result of Chi Square test between 2 variables: gender and length of service. If the Null Hypothesis is stated as "There is no significant association between gender and length of service", then table above will clearly allow us to conclude that "there is no significant association between gender and length of service". A. True B. False

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