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12 results for “population”

Formulae (12)

\bar{x} \pm z\frac{\sigma}{\sqrt{n}}

Range likely to contain the population mean.

s^2 = \frac{1}{n-1}\sum(x_i-\bar{x})^2

Unbiased estimate of population variance.

p^2 + 2pq + q^2 = 1

Genotype frequencies in a non-evolving population.

N_t = N_0 e^{rt}

Unlimited growth of a population over time.

\frac{dN}{dt} = rN\left(1 - \frac{N}{K}\right)

Population growth limited by carrying capacity.

t_d = \frac{\ln 2}{r}

Time for a population to double.

N = \frac{M \times C}{R}

Population size from mark-and-recapture sampling.

r = \frac{B - D}{N}

Per-capita growth from births and deaths.

\frac{GDP}{Population}

Average economic output per person.

D = \frac{P}{A}

Number of people per unit area.

N = N_0 e^{rt}

Growth of a population at a constant rate.

\frac{dN}{dt} = rN\left(1 - \frac{N}{K}\right)

Population growth that slows as it nears carrying capacity.