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It is a sample in which the respondent decides whether or not to participate. A typical situation would be when a pile of questionnaires is left for people to fill in - if they like. Only those so inclined will do so.
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What is a sample that is taken without bias?
A randomly selected sample.
Randomly selected portion of the population?
sample
When you draw a sample from a normal distribution what can you conclude about the sample distribution?
The answer depends on how the sample is selected. If it is a simple random sample, of size n, then it is distributed approximately normally with the same mean as the population mean.The answer depends on how the sample is selected. If it is a simple random sample, of size n, then it is distributed approximately normally with the same mean as the population mean.The answer depends on how the sample is selected. If it is a simple random sample, of size n, then it is distributed approximately normally with the same mean as the population mean.The answer depends on how the sample is selected. If it is a simple random sample, of size n, then it is distributed approximately normally with the same mean as the population mean.
Which type of sample is selected to reflect the demographic characteristics of the population of interest?
Convenience sample
What is it called when all the items in the population have the same chance of being selected for the sample?
a random sample
