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Because it would usually be prohibitively expensive and time consuming to collect information from every single member of the population and because the law of large numbers is sufficiently robust to allow most characteristics of a population to be measured with sufficient accuracy from a sample.
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What is a sample study?
sample is the population we make our study about them.
What effect does non-random sample have on what you can say about the results of a study?
It means that the results of the study cannot be claimed to hold for the entire population from which the sample was drawn. The researchers can only claim that their results hold for the individuals selected into their sample.
What is N is statistics?
The Population of the data set. If there was a study of 5000 people, 50 were randomly selected as a sample, then "N" would be 5000.
If a population consisted of 1000 people a sample of the population could consist of which number of people?
A sample from a population of 1,000 people can consist of any number from 1 to 1,000 individuals, depending on the sampling method and purpose of the study. Typically, researchers choose a sample size that is manageable and representative, often ranging from a few dozen to several hundred individuals. The key is to ensure the sample accurately reflects the characteristics of the overall population to draw valid conclusions.
Suppose a population contains 400000 people. All else being equal a study based on a population sample that includes numbers of respondents would be the most reliable?
400
