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Chapter 36: Problem 5

Describe how a researcher would best collect data in order to calculate mortality rates within a population. a. For various age groups, count the number of individuals that died and the number that survived within a defined time period. b. For various age groups, count the number of individuals that were born and the number that died within a defined time period. c. For each sex, count the number of individuals that were born and the number that survived within a defined time period. d. For each sex, count the number of individuals that died and the number that were born within a defined time period.

Short Answer

Expert verified
Option A is the best: count the number of individuals that died and the number that survived for various age groups within a defined time period.

Step by step solution

01

Interpret the Problem

First, understand that the goal is to calculate mortality rates within a population. Mortality rate is defined as the number of deaths in a specific population, scaled to the size of that population, per unit of time.
02

Identify Relevant Data for Mortality Rate Calculation

To calculate mortality rates, you need to count the number of individuals that died and the total number of individuals in the population within a defined time period. The most relevant option will focus directly on deaths and survivors.
03

Analyzing Option A

Option A suggests counting the number of individuals that died and the number that survived for various age groups within a defined time period. This provides the necessary data to calculate the mortality rate as it focuses directly on deaths and the corresponding population.
04

Analyzing Other Options

Option B considers births and deaths for various age groups, which is more suited for birth rate or population growth analysis. Option C focuses on births and surviving individuals but does not directly address deaths. Option D counts the number of births and deaths for each sex, adding a gender dimension, but is more complex than needed for a straightforward mortality rate calculation.
05

Select the Correct Data Collection Method

Based on the analysis, the best method to collect data for calculating mortality rates is described in option A: counting the number of individuals that died and the number that survived within a defined time period for various age groups.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Population Data
Mortality rate calculation starts by understanding your population data. The population consists of all individuals within a defined area or group. This data is essential as the mortality rate is typically assessed per a specific portion of this population, like per 1000 or 100,000 individuals. To get accurate results, you need precise population data including total numbers and categories such as age groups and sexes. Reliable population data forms the backbone of all subsequent mortality rate calculations.
Age Groups
When calculating mortality rates, breaking down the population into age groups is helpful. Age groups are cohorts of individuals categorized by age ranges, such as 0-10 years, 11-20 years, etc. Different age groups may have varying mortality rates due to factors like health conditions, lifestyle, and biological vulnerabilities. By analyzing age-specific mortality rates, you can identify which age groups are most at risk and understand patterns of mortality across a population. This stratification simplifies comparisons and provides clearer insights.
Death Count
Death count refers to the number of individuals who have died within a specific time period. Accurately counting these deaths is critical for calculating mortality rates. This involves collecting verified death records from hospitals, registries, or other credible sources. Ensure the death count is segmented according to the same criteria used in your population data, such as age groups and sex, to facilitate accurate mortality rate calculations.
Survivors
Survivors are individuals within the population who have not died during the specified time period. Counting survivors helps in determining the size of the population still at risk. This data, combined with the death count, allows for the calculation of mortality rate by comparing the number of deaths to the total number of individuals exposed to the risk of death. Tracking survivors is as crucial as tracking deaths to ascertain a complete picture of the health and vitality of the population.
Data Collection
Effective data collection is key to accurate mortality rate calculations. This involves gathering detailed and verified data on both deaths and survivors within a specified period. Use reliable sources such as health records, national statistics, and census data. Organize this data systematically, ensuring it is broken down into relevant categories like age groups and sex. Employ consistent data recording methods to minimize errors. Proper data collection forms the foundation of meaningful mortality rate analysis, ensuring all aspects of the population鈥檚 mortality trends are captured accurately.

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Most popular questions from this chapter

A flask of nutrient broth, buffered to maintain pH, is inoculated with a strain of E. coli. The flask is placed in a constant temperature environment where it is aerated by shaking. A. Predict the effect of a change in energy availability over time. B. Represent the change graphically in terms of the number of cells as a function of time. C. In your graph as time progresses there is a change in the growth rate of the population. Add annotation to your graph to describe the time interval during which the growth rate is increasing linearly in proportion to the number of cells. Add annotation to your graph to describe another time interval during which the growth rate is decreasing in proportion to the square of the number of cells. Add a third annotation to describe an interval of time where the rate of growth is zero. D. Select and justify two measurements of the E. coli population that could be made at two different points in time during growth that would be sufficient to answer questions about the population size at any time. E. Describe the population of E. coli if the environment was continuously supplement by additional nutrient broth.

Give examples of how two different populations of organisms might have the same population density, but different dispersal patterns. a. Two populations could occupy the same range with the same number of individuals, giving different dispersal patterns. However, both the populations may be dispersed randomly throughout the range, giving identical population densities. b. Two populations could occupy the different range with the different number of individuals, giving different dispersal patterns. However, both the populations may move over this range in a herd, giving identical population densities. c. Two populations could occupy the same range with the different number of individuals, giving identical population densities. However, one population may move over this range in a herd while the other population may be dispersed randomly throughout the range. d. Two populations could occupy the same range with the same number of individuals, giving identical population densities. However, one population may move over this range in a herd while the other population may be dispersed randomly throughout the range.

\(\begin{array}{|c|c|}\hline \text { Date } & {N} \\ \hline 5 / 1 /12 & {56} \\\ \hline 6 / 1/12 & {98} \\ \hline 7 / 2 / 12 & {203} \\ \hline 8 / 10 / 12 & {421} \\ \hline\end{array}\) These data were collected on a population of beetles in Florida. Based on the data, how would you describe population growth in this case and what do you predict about growth of this population in the future? Explain your reasoning. a. Population shows logistic growth, as number of individuals doubles every month and will likely continue to grow logistically until its resources become depleted. At that point, the population growth rate will slow down and level off to zero. b. The population shows exponential growth, as the number of individuals doubles every month and will likely grow logistically in the future when the resources become limited. At that point, the population growth rate will slow down and level off to zero. c. The population shows exponential growth, as number of individuals doubles every month and will likely continue to grow exponentially until its resources become limited. At that point, the growth will become logistic; the population growth rate will slow down and level off to zero. d. The population shows logistic growth and is likely to grow exponentially as the resources are probably increasing. The population growth rate will increase in the future as well.

Describe how a researcher could determine the population size and density of a bird population on one of the Hawaiian islands. a. Population size can be determined by life tables. The area of the island in square kilometers is divided by the population size to determine the density of the bird population. b. Population size can be determined by the mark and recapture method. The population size is divided by the area of the island in square kilometers to determine the density of the bird population. c. Population size can be determined by life tables. The population size is divided by the area of the island in square kilometers to determine the density of the bird population. d. Population size can be determined by the mark and recapture method. The area of the island in square kilometers is divided by the population size to determine the density of the bird population.

Predict how human population change in the next 50 years is likely to affect marine ecosystems. a. Humans will decrease their own carrying capacity, which will also decrease the carrying capacities of marine ecosystems. b. Decreased fishing can be expected, which will lead to rebounds in fish populations and healthier marine ecosystems. c. Increases in greenhouse gas emissions are likely, with increases in ocean temperatures that trigger shifts in marine populations. d. Biodiversity of marine ecosystems will increase as humans use engineering to increase food production in the oceans.
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