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Using sample that does not match the population
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∙ 15y ago
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What are disadvantages of sampling?
Mostly can be biased and in some cases can choose people/units innapropriate for the circumstances
What are the various kind of sampling?
They include: Simple random sampling, Systematic sampling, Stratified sampling, Quota sampling, and Cluster sampling.
What are the sources of sampling errors?
Sampling and Non sampling errors
Explain how a person taking a survey to find the percent of sport fans who chose baseball as their favorite sport might get a biased sample?
Conduct your sampling at a baseball game, a baseball museum or at a meeting of Little League coaches.
What sampling method?
Random Sampling
Show that in simple random sampling the sample variance is an unbiased estimator of population variance?
It is a biased estimator. S.R.S leads to a biased sample variance but i.i.d random sampling leads to a unbiased sample variance.
What are disadvantages of sampling?
Mostly can be biased and in some cases can choose people/units innapropriate for the circumstances
Advantages of census over sample survey?
It is more accurate, unbiased and includes every item in the population, whereas sampling may be biased, and sampling is not totally representative.
What is self-selected sampling?
Self-selected sampling is a technique in data gathering which participants are taking initiative in the test or survey conducted. This brings results that are often biased and inconclusive.
What are the disadvantages of opportunity sampling?
Its very easy to get a biased sample. E.g. You stand outside a uni or stand in a mall in a richer district.
Difference between restricted and unrestricted sampling?
Difference between restricted sampling and unresticted sampling
What is bias in sampling?
a person taking a survey to find the percent of sport fans who chose baseball as their favorite sport might get a biased sample
What is bias sample?
Sampling bias occurs when the sampling frame does not reflect the characteristics of the population which is being tested. Biased samples can result from problems with either the sampling technique or the data-collection method. Essentially, the group does not reflect the population which is supposed to be represented in the given survey or test. For example: If the question being asked in a survey was "do American's prefer Coca-Cola or Pepsi?" and all people asked were under 18 and from California, there would be a sampling bias as the sampling frame would not accurately represent "American's".
What are the methods of sampling?
systematic- a member of the population is selected at random convenience- the most-available members of the population are chosen self-selected- members of the population volunteer to respond to a survey. Note: Biased questions- Example what about a new subway 85%yes,15%no. This question is biased because only people who ride the subway would say yes. -information provided by HOLT
The best most reliable sampling technique is the one that has the smallest chance of unknowingly producing biased results in a study?
Convenience sample Systematic sample Simple random sample (SRS) Census
What are the various kind of sampling?
They include: Simple random sampling, Systematic sampling, Stratified sampling, Quota sampling, and Cluster sampling.
Before George Gallup polling samples were often?
Before George Gallup, polling samples were often small and not scientifically selected, leading to biased or unreliable results. Gallup revolutionized polling by using rigorous sampling methods to ensure accurate representation of the population, making his polls more trustworthy and influential.
