Some important characteristics of population include ___________.
A: genetics
B: natality and mortality
C: sex ratio and age distribution
D: density and spatial distribution.
A: genetics
B: natality and mortality
C: sex ratio and age distribution
D: density and spatial distribution.
举一反三
- Age distribution is the number of individuals of each age in the population which influences greatly the rate of population growth。 （ ）
- If n samples are extracted from any population with mean value [img=11x18]1803dc1a4012523.png[/img] and variance [img=18x22]1803dc1a48a9511.png[/img], then A: When n is sufficiently large, the distribution of sample mean is approximately normal distribution. B: When n<10, the distribution of sample mean is approximately normal distribution. C: The distribution of sample mean is nothing to do with n. D: No matter how big n is, the distribution of the sample mean is not going to be close to a normal distribution.
- The<br/>population inversion distribution is also called as() A: Negative<br/>temperature distribution B: Boltzmann<br/>distribution C: Thermal<br/>equilibrium distribution D: Maxwell<br/>distribution
- Which one is not the characteristics of epidemiology ? A: Population level B: Start from the distribution C: Treatment only D: Comparision E: Prevention
- Table<br/>2 shows the _____ of the responders by age, sex, and type of<br/>employers.() A: determination B: distribution C: disturbance D: deception