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Updated: Jul 11, 2026

Optical Trawl Surveys of Groundfish: A Video Trawl Survey of Western Gulf of Maine Atlantic Cod (Gadus morhua)
05:00

Optical Trawl Surveys of Groundfish: A Video Trawl Survey of Western Gulf of Maine Atlantic Cod (Gadus morhua)

Published on: March 20, 2026

大西洋鱼:库存的谨慎和丰富性

T D Iles, M Sinclair

    Science (New York, N.Y.)
    |February 5, 1982
    PubMed
    概括

    遗传上不同的大西洋鱼种群是由稳定的幼虫保留区域定义的,影响着种群规模. 目前的产卵时间假设缺乏经验支持,需要新的管理策略.

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    Published on: November 20, 2017

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    Testing a Claim about Mean: Known Population SD01:11

    Testing a Claim about Mean: Known Population SD

    A complete procedure of testing the hypothesis about a population mean is explained here.
    Estimating a population mean requires the samples to be distributed normally. The data should be collected from the randomly selected samples having no sampling bias. The sample size needed to be higher than 30, and most importantly, the population standard deviation should be already known.
    In most realistic situations, the population standard deviation is often unknown, but in rare circumstances, when it...