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If the incidence rate of a very serious disease is 25/100,000 person-years and the prevalence of this disease in the population is 75/100,000, what is the average survival time of individuals who contract this disease? [Assume the population is in steady state]
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- Using the above graph, what is the approximate percent of the population in the US and Kenya that is under the age of 15? (number order represents US, Kenya) A24,26 B12,28 C32,62 D16,36It is often stated that excess mortality (in general) is higher in low socioeconomic populations. Which factors contribute to this statistic?A population of 30 rabbits has been introduced into a new region. It is estimated that the maximum population the region can sustain is 400 rabbits. After 1 year, the population is estimated to be 90 rabbits. How many rabbits will there be after 3 years? In a city whose population is 100 000 an outbreak of flu occurs. When the city health department begins, its record keeping, there are 625 infected people. The number of infected people N is increasing at a rate proportional to the square root number of infected people at time t in weeks. One week later, there are 1600 infected people. Find the number of infected people two weeks after the record keeping begins.
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- The term LD 50 refers to the concentration of a drug or chemical that will kill 50% of the population exposed to the drug. The LD 50 of Pb is 5 ppm. What is the LD 50 for Pb in ppt and ppb? The term LD 50 refers to the concentration of a drug or chemical that will kill 50% of the population exposed to the drug. The LD 50 of Pb is 5 ppm. What is the LD 50 for Pb in ppt and ppb? 5000 ppt, 0.05 ppb 50 ppt, 5000 ppb 0.005 ppt, 5000 ppb 0.005 ppt, 5000 ppmThe growth rate of a population per unit of time is calculated by using this formula: G = r x N. What is the quantity r and how is it calculated?Explain what is happening to the population at points A, B, C, and Din the following diagram.
- The per capita birth (b) and death (d) rates are measured for two populations across a range of population sizes in the attached figure. The equation for exponential growth rate is dN/dt=rN where the per capita growth rate is r=(b-d). The equation for logistic population growth rate is dN/dt=rN(1-N/K). With logistic growth, r varies as a function of the population size with density-dependent birth and/or death rates. See attached image If the death rate decreased, what would happen to the population trajectory for population A? a) increase faster b) increase slower c) decrease faster d) decrease slowerIf the population of 150 squirrels at UofL has 15 births this year, what is the per capita birth rate? - 0.1 squirrels/yr/squirrel If the population of 150 squirrels at UofL has 10 deaths this year, what is per capita death rate? - 0.067 squirrels/yr/squirrel Calculate the intrinsic rate of increase for this squirrel population, using your answers to the questions above. - 0.03 squirrels/yr/squirrel Between having plenty of shelter in the trees and scavenging through the campus garbage, UofL squirrels have seemingly unlimited resources. Using the information you've calculated so far, determine the growth increment for the coming year for the UofL squirrel population. - 4.5 squirrels/yr Let's say that, after you calculated your predictions for unlimited growth of the UofL squirrel populations in the questions above, a bad storm comes through campus and wipes out half the trees! Now, the growth of the population of squirrels becomes limited. There are still 150 squirrels, but the…In the SIR model, if S is 99 and I is 1 (total population is 100) at the beginning of a disease infection, which has R0 of 2 and average infectious period of 10 days. What is the transmission rate (beta)? a.0.1 b.0.2 c.0.002 d.2