The fox population in a certain region has a continuous growth rate of 9 percent per year. It estimated that the population in the year 2000 was 29100. (a) Find a function that models the population t years after 2000 (t = 0 for 2000). Hint: Use an exponential function with base e. Your answer is P(t) = Preview (b) Use the function from part (a) to estimate the fox population in the year 2008. Your answer is (the answer must be an integer) Preview Get help: Video
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- Consider a simple growth regression. Suppose output is measured with some random error. Explain the consequences for the estimated convergence coefficient.Assume the carrying capacity of the earth is 9 billion. Use the 1960s peak annual growth rate of 2.1% and population of 3 billion to predict the base growth rate and current growth rate with a logistic model. Assume a current population of 6.8 billion. How does the predicted growth rate compare to the actual growth rate of about 1.2% per year?What conditions must non-linear time series models, such as vector autoregressive models, satisfy in order to use impulse response functions
- Use Exponential Models in Applications In the following exercises, solve. In the last five years the population of the UnitedStates has grown at a rate of 0.7% per year to about318,900,000. If this rate continues, what will be thepopulation in 5 more years?Alternative Measures of Productivity A common measure of productivity, as explained in thischapter and as used by many business and trade organizations, including the U.S. Bureau of LaborStatistics, is the ratio of output to input, where input is typically measured in units of materials, laborhours, or related measures. An alternative is to use the ratio of capacity available to capacity utilized. For example, the amount of capacity in the U.S. manufacturing industries has almost doubledover the past two decades. However, the rate of capacity utilization (output/capacity available) hasfallen slightly over this period of time, with a steep drop in 2009 followed by slow increases in 2010and 2011. Some would say that this measure gives a better picture of productivity than the one wehave used in the chapter.Required Compare the measure of productivity based on capacity utilization with the measure used inthe chapter. Which measure do you think is most useful for assessing the state of the…Over the past year, in a given country, labor productivity (measured in hours worked) has increased by 5%; the total number of hours worked has remained the same; the number of workers increased by 5%, while the general population increased by 3%. Given this information, what is the approximate growth in the standard of living of this country
- The rate of U.S. per capita sales of bottled water for the period 2000–2010 can be approximated by s(t) = −0.18t2 + 3t + 15 gallons per year (0 ≤ t ≤ 10), where t is the time in years since the start of 2000.† After conducting a survey of sales in your state, you estimate that consumption in gyms accounts for a fraction f(t) = 0.2 + 0.04t of all bottled water consumed in year t. Assuming that your model is correct, estimate, to the nearest gallon, the total amount of bottled water consumed per capita in gyms from the start of 2002 to the start of 2010. HINT [Rate of consumption = s(t)f(t).] _____galIt is projected that in the future, the population of a certain country in millions will be P(t)= 85e^.05t, where t is is time in years since 2022. Round all answers to the nearest whole number a. What is the projected population of the town in 2026 b. Find the simplified derivative function c. At what rate will the population be changing in 2026 d. In what year was the population increasing at a rate of 5 million people per year e. When will the population reach 160 millionI need some help, Also can you show me all the steps, please? Lizards of a valuable breed (Alligator lizards) have been introduced onto Lizard Island and their population is growing. The Population (P) is modelled by the differential equation dp/pt=-k(p-m) where t is the number of years that have passed since January 2022, M is an upper bound on the population due to limitations on the island’s natural resources, and k is a constant relating to the net population growth rate. Customers (Paying tourists) of the island seeing some lizards is essential for the business, so the operator is keen for the number of lizards to reach 75% of M in January 2028 (a) Use the separation of variables technique to formulate a solution to the differential equation. (b) In January 2022, there were 50 lizards and in January 2023 there were 60. Current scientific research estimates k as 0.05, but M is unknown. Estimate M from this data. (c) The business wants to start feeding the lizards vitamins from…
- The forecasting staff for the Prizer Corporation has developed a model to predict sales of its air-cushioned-ride snowmobiles. The model specifies that sales S vary jointly with disposable personal income Y and the population between ages 15 and 40, Z, and inversely with the price of the snowmobiles P. Based on past data, the best estimate of this relationship is S=kYZP where k has been estimated (with past data) to equal 100. If Y=11,000,Z=1,200, and P=20,000, what value would you predict for S? What happens if P is reduced to $17,500? How would you go about developing a value for k? What are the potential weaknesses of this model?The number of bacteria in a culture is increasing according to the law of exponential growth. There are 125 bacteria in the culture after 2 hours and 385 bacteria after 4 hours. (a) Find the initial population. (Round your answer to the nearest whole number.)bacteria (b) Write an exponential growth model for the bacteria population. Let t represent the time in hours.y = (c) Use the model to determine the number of bacteria after 8 hours. (Round your answer to the nearest whole number.)bacteria (d) After how many hours will the bacteria count be 40,000? (Round your answer to two decimal places.)hrUse this method, Exponential decline model, to solve ( in petroleum economics) The production of the oil well decline exponentially, the initial flow rate is 1500 STB/day, the production rate of this well become 120 STB/day in the fourth year, find the production rate after 25 months from the beginning, find yearly production and production rate for this well for the next 4 years?