Table 2: Test ResultsDiabeticNot DiabeticPositive to urine test, negative to blood73Positive to blood test, negative to urine2311Positive to both tests457Negative to both tests1247,620ТОTAL1997,641a. How do the sensitivity or specificity of each combination of the tests changewhen compared with single test?b. assuming you are the harried director of the diabetes screening program, whichtest or combination of tests would you prefer to use?

Given information: Test Results Diabetic Not Diabetic Positive urine test, Negative to blood 7…

Answered: Table 2: Test Results Diabetic Not…

Linear Algebra: A Modern Introduction

4th Edition

ISBN:9781285463247

Author:David Poole

Publisher:David Poole

Chapter2: Systems Of Linear Equations

Section2.4: Applications

Problem 28EQ

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A company claims that its brand of dish detergent, A, is more effective than a competitor’s brand, B. Fifty dirty dishes are randomly selected and randomly divided into two groups. In one group, each dirty dish will be placed in a container of hot water with Brand A detergent and in the other group, each dirty dish will be placed in a container of hot water with Brand B detergent. The dishes will sit for two hours, and then the cleanliness of the dishes will be measured using a scale of 1–10 (1 = least clean to 10 = most clean). The difference in mean cleanliness ratings for the two detergents (A – B) will then be calculated. What is the appropriate inference procedure?
A graduate student realized that the depression study above in Question 4 should have had a placebo condition in which a third group was given a pill just as the people in the Drug condition were, but where the pill was not Drug D (e.g., a sugar pill). So she designed a new experiment with three conditions -- Drug, No Drug, and Placebo. To perform the experiment, the graduate student randomly assigned 18 people into the three groups so that each group has 6 people. After one month of treatment, all 18 people were asked to rate on a scale from 1 to 7 how depressed they felt, where 1 = not depressed at all and 7 = very depressed. The following are the data: Drug No Drug Placebo 2 4 5 3 5 5 4 5 6 4 4 5 2 6 4 3 6 5 nD = 6 nND = 6 nplacebo = 6 MD = 3 MND = 5 Mplacebo = 5 Using an α-level of .05, perform an…
A product development scientist is tasked with determining which of three methods is the most effective for catching fruit flies: a sticky paper trap, a liquid trap, or a container trap. The scientist hypothesizes that all three methods will be equally effective at catching the fruit flies. To investigate, he releases a random sample of 300 fruit flies in an enclosed area containing each of the three traps. He finds that 145 got stuck on the sticky paper, 80 were caught in the liquid trap, and 75 were caught in the container trap. He would like to know if these data provide convincing evidence that the three methods are not equally effective at catching fruit flies. What is the value of the chi-square test statistic and P-value? Find the chi-square table here. χ2 = 30.5, P-value is less than 0.0005 χ2 = 30.5, P-value is greater than 0.25 χ2 = 27.30, P-value is less than 0.0005 χ2 = 27.30, P-value is greater than 0.25
SO what would be the L, Lq, and Wq of this problem? Assuming we are trying to develop and sovle a waiting line system that can accomodate this increased leel of passenger traffic.

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