Consider the spreading of Covid-19 in a company of 200 employees. 10 % of the employees have comorbidities and are more likely to have severe illnessfrom Covid-19. Assume the virus spreads only during work lunch breaks and the increase in the number of employees infected is proportional to thecurrent number of employees infected and also proportional to the current number of employees without Covid-19.Let an be the number of employees infected after n lunch breaks. Letk be the proportionality constant.Which is the following equations is a possible model for the above scenario?an-1= an + kan (20 - a,)an-1=an + kan-1 (200- a-1)an-1 = an + ka-an-1ka, (20- an)None of the above

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Answered: Consider the spreading of Covid-19 in a…

Linear Algebra: A Modern Introduction

4th Edition

ISBN:9781285463247

Author:David Poole

Publisher:David Poole

Chapter2: Systems Of Linear Equations

Section2.4: Applications

Problem 1EQ: 1. Suppose that, in Example 2.27, 400 units of food A, 600 units of B, and 600 units of C are placed...

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Suppose that a COVID-19 vaccine is 100% effective and Ro of COVID-19 is 2.5. What is the percentage of the population that needs to be fully vaccinated to reach herd immunity?
Use the below table to determine If Covid-19 had an impact on the GPA of student based on their GPA in 2019-2020 (before Covid) and their GPA in 2020-2021 (during Covid) and their current gpa. GPA-Semester 1 2019-2020 GPA-Semester 1 2020-2021 Current GPA 3.5 3.6 3.5 3.8 3.8 3.9 3.3 2.7 2.7 3.4 3.3 3.2 3.3 3.8 3.9 3.6 4.2 4 2.5 3.9 4 3.5 3.7 3.7 3.5 3.7 3.9 3.4 3.6 3.4 3.2 3.6 3.8 3.6 3.5 3.5 3.8 3.8 3.4 3.8 3.8 3.8 3.1 2 2 3.7 3.7 3.7 3.6 3.6 3.6 2.7 3.9 3.9 3 3 3.7 4.3 3.7 3.8 3.7 3.6 3.6 3 3.1 3.5 4.3 3.6 3.5 3.8 3.4 3.3 3.1 3.5 3.6 4.1 4 3.6 3 3 3.1 3.4 3.3 3 3.8 4 3.9 4 3.6 3.4 Above 4.3 Above 4.3 4.2 3.7 4 4 3.5 4 3.8 2.6 3.1 2.9 3.5 3.5 3.5 2.7 3.5 3.5 3.8 3.6 3.8 2.3 3.6 3.5 4 4 4 3.4 3.5 3.4 4 3.8 3.7 3.5 3.4 3.4 3.8 3.9 4 3.3 3.8 3.9 4 4 4.1 3.9 4 3.8 3.9 4 3.7 3.6 3.4 3.4 3.5 3.4 3.5 4.3 4.2 4.2 3.2 3.2 3.2
The COVID-19 (coronavirus) mortality rate of a country is defined as the ratio of the number of deaths due to COVID-19 divided by the number of (confirmed) cases of COVID-19 in that country. Suppose we want to investigate if there is any difference between the COVID-19 mortality rate in the US and the UK. On April 18, 2020, out of a sample of 671,493 cases of COVID-19 in the US, there was 33,288 deaths; and out of a sample of 109,754 cases of COVID-19 in the UK, there was 14,606 deaths. What is the 92% confidence interval in the true difference in the mortality rates between the two countries? What can you conclude about the difference in the mortality rates between the US and the UK? Justify your conclusions.
In the current pandemic, researchers are working on creating antibody tests to determine which individuals have already had an infection caused by the COVID-19 virus. If someone has been infected, then they will have certain antibodies in their system and the hope is that a highly accurate test can be created to detect these antibodies. Assume a researcher creates a new antibody test, which for individuals who are known to have had the infection in the past and thus truly have the COVID-19 antibodies, gives a positive result 95% of the time. This same test gives a negative result 90% of time for people who do not have the antibodies. Assume that COVID-19 has affected 5% of the population in the region of interest. What is the probability someone has NOT been infected previously given that their antibody test result comes back positive? [four decimals]
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According to scientists, the cockroach has had 300 million years to develop a resistance to destruction. In a study conducted by researchers, 6 comma 0006,000 roaches (the expected number in a roach-infested house) were released in the test kitchen. One week later, the kitchen was fumigated and 18 comma 10718,107 dead roaches were counted, a gain of 12 comma 10712,107 roaches for the 1-week period. Assume that none of the original roaches died during the 1-week period and that the standard deviation of x, the number of roaches produced per roach in a 1-week period, is 1.61.6. Use the number of roaches produced by the sample of 6 comma 0006,000 roaches to find a 9595% confidence interval for the mean number of roaches produced per week for each roach in a typical roach-infested house. Find a 95% confidence interval for the mean number of roaches produced per week for each roach in a typical roach-infested house.
If the alleles A and B of the cystic fibrosis gene occur in a population with frequencies p and 1 - p (where pis between 0 and 1), then the frequency of heterozygous carriers (carriers with both alleles) is 2p(l - p). Which value of p gives the largest frequency of heterozygous carriers?
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