| 词汇 | random-sample |
| 释义 | random sample noun[ C ] ukus MARKETING a group of people, data, etc. that is chosen from a larger group without using any system, plan, or rule: The survey interviewed a random sample of 850 adults. random samplingnoun[ C or U ] Fraud is kept down by random sampling. Examples of random samplerandom sample It uses a stratified randomsample technique and an oversample of non-marital births. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A simple randomsample is an unbiased surveying technique. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Getting a high response rate (80%) from a small, randomsample is considered preferable to a low response rate from a large sample. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. That is, the alleles in the offspring are a randomsample of those in the parents. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. The statistical errors on the other hand are independent, and their sum within the randomsample is almost surely not zero. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. That proportion is the parameter sought; the estimate is based on a small randomsample of voters. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In stratified sampling, a randomsample is drawn from each of the strata, whereas in cluster sampling only the selected clusters are studied. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This can be achieved by drawing a randomsample from the original population at risk. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. A pure randomsample is an inefficient method of collecting such data, but observations made sequentially can not be treated as independent observations. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. However, it is standard practice to assume that the sample mean from a randomsample is normal, because of the central-limit theorem. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors. |
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