An outbreak of a new virus has swept across a large city with over a million...

An outbreak of a new virus has swept across a large city with over a million residents. City officials do not yet have the ability to conduct widespread testing of residents to determine the scope to which the virus has spread. In a random sample of 200 residents, city health officials find that 32 test positive for the virus.

a) In a random sample of 200 residents city health officials find that 32 test positive for the virus. Construct and interpret a 95% confidence interval for the proportion of all the city residents that would test positive for the virus at this point in time. (Show all necessary checks.)

Interval:.\

Interpretation:

b) (5pts) Does the confidence interval constructed in part (a) cover the value of the overall percentage of residents that would test positive for the virus? (Circle one)

Yes No Cannot tell

c) Suppose that the true overall percentage of residents that would test positive for the virus is 30%s. What percentage of samples of size 200 would produce an 80% confidence interval containing 30%?

d) What is the best way to decrease the width of a confidence interval without lowering the level of confidence? Write you answer using a single complete sentence.

e) City health officials currently believe that at least 15% of residents current would test positive for the virus. Determine the minimum sample size required if the officials wish to estimate the overall percentage of residents who would test positive for the virus to within 5% ounces with 99% confidence

Expert Solution

We construct the C.I using the formula mentioned. The critical values are obtained from STATKEY (images attached for reference).

orchestra answered 2 years ago

The Corona virus outbreak has had a significant impact on all of our lives over the...

The Corona virus outbreak has had a significant impact on all of our lives over the last two months and we know that some of these effects are going to linger for some time. So, I want you to get creative and tell me about the economic impact in life. Work in some economic terminology into your account. You can talk about prices and wages, unemployment, opportunity costs, diminishing marginal returns, savings, health care, increased demand for amazon or netflix...

The outbreak of a new virus has recently reached Connecticut. According to CDC, since diahrrea is...

The outbreak of a new virus has recently reached Connecticut. According to CDC, since diahrrea is a rare symptom, the shortage of toilet paper is not related to the event. There are 169 towns in the state. In 70 towns there is no toilet paper shortage. In 20 towns some patients tested positive for the virus. In 9 towns there were positive tests and the toilet paper shortage. Are the events ’shortage of toilet paper’ and ’new virus’ outbreak dependent...

Some time ago the swine flu bug swept across the U.S. Suppose now that a new...

Some time ago the swine flu bug swept across the U.S. Suppose now that a new flu bug (the “feline” flu) is threatening the health of U.S. residents. Assume that you work for the Harvard School of Public Health, and that you need to quickly determine how the American public is responding to the current feline flu issue. The objective is to find out how people’s behavior might have recently changed because of their concerns about contracting the flu. For...

An outbreak of this disease in New York City in 1999 was originally diagnosed as St....

An outbreak of this disease in New York City in 1999 was originally diagnosed as St. Louis Encephalitis, but it was later determined that it was actually ________. Lyme Disease Legionnaires Disease West Nile Virus Western Equine Encephalitis In New York City, health officials discovered that the mosquitos were the _________, or delivery agent that helped spread the West Nile Virus fomite host prion vector In epidemiology, there are three important questions that all epidemiologists will ask. What are they?...

You are an intern at the health department of your city. An outbreak of coronavirus has...

You are an intern at the health department of your city. An outbreak of coronavirus has been detected in a hotel in your city. 10 guests are infected. You must decide whether to quarantine the hotel or not. There are 1000 guests in the hotel. From previous experience, we know that at least half of them will be infected if the quarantine goes in to effect. If there is no quarantine the virus will spread more rapidly to the general...

A study analysed data on all suspected cases of a new virus in a certain city...

A study analysed data on all suspected cases of a new virus in a certain city within the past month. The analysis collected data on whether the suspected cases have worn a mask in the past month prior to the test for the new virus and the corresponding test results. The data are then summarised as follows: Test Result Positive Negative Total Not Wearing Mask 105 175 280 Wearing Mask 20 575 595 Total 125 750 875 (a) Using a...

Antibody tests for the Covid-19 virus are not perfect. In New York City, 19% of the...

Antibody tests for the Covid-19 virus are not perfect. In New York City, 19% of the population are believed to have been infected with the virus. If the sensitivity of a test is 88.89%, and the false positive rate is 5.86%, what is the probability that a person has the antibodies, given that person got a positive result? Round your answer to the nearest percent. For example, enter 80 for 80 percent.

Your company has purchased a large new truck-tractor for over the road use. It has a...

Your company has purchased a large new truck-tractor for over the road use. It has a cost basis of $209,697. Its MV at the end of 18 years is estimated as $1,271. Assume it will be depreciated using DDB method and the depreciation period is 18 years. What is the depreciation payment in year 4?

The outbreak and spread of COVID-19 virus has had effects beyond the health issues. Discuss how...

The outbreak and spread of COVID-19 virus has had effects beyond the health issues. Discuss how Covid-19 has or can have an impact on the U.S. or global or any country's economic conditions. Assume that you are thinking to pursue your enterprise venture in 2020, what are the effects of this virus on your plan. Of what economic indicators do you expect to resume your venture.

You live in a midwestern city of about 1 million people. The SARS-Cov2 virus entered your...

You live in a midwestern city of about 1 million people. The SARS-Cov2 virus entered your community a few months ago, as indicated by a building influx of patients into local hospitals with symptoms of a severe respiratory illness indicative of COVID-19. Limited testing for those individuals who have been hospitalized has been positive for the virus. In response to diminishing available hospital beds, you have been tasked to head a community-based screening effort to help stop the spread of...

Question