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The sample mean is a Fisher consistent and unbiased estimate of the population mean, but not all Fisher consistent estimates are unbiased. Suppose we observe a sample from a uniform distribution on (0,θ) and we wish to estimate θ. The sample maximum is Fisher consistent, but downwardly biased.
Population bottleneck followed by recovery or extinction. A population bottleneck or genetic bottleneck is a sharp reduction in the size of a population due to environmental events such as famines, earthquakes, floods, fires, disease, and droughts; or human activities such as genocide, speciocide, widespread violence or intentional culling.
Jack mackerel caught by a Chilean purse seiner Fishing down the food web. Overfishing is the removal of a species of fish (i.e. fishing) from a body of water at a rate greater than that the species can replenish its population naturally (i.e. the overexploitation of the fishery's existing fish stock), resulting in the species becoming increasingly underpopulated in that area.
The researchers determined the scale of this catastrophic population loss by tracking extreme population declines at 13 colonies across the Gulf of Alaska and Bering Sea that have been monitored ...
Rural counties in the United States make up about 70 percent of the nation's land mass. Historically, population increase from births in rural areas more than compensated for the number of people moving from rural areas to urban areas, but from 2010 to 2016, rural areas lost population in absolute numbers for the first time. [24]
The world's population numbered nearly 7.6 billion as of mid-2017 and is forecast to peak toward the end of the 21st century at 10–12 billion people. [148] Scholars have argued that population size and growth, along with overconsumption , are significant factors in biodiversity loss and soil degradation.
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In 2000, unpartnered adults accounted for 38% of the population, said Fry, who heads a team of researchers focusing on family and American work life. ... and data from the bureau shows the number ...