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unbiased.
1- Assuming this represents a random sample from the population, the sample mean is an unbiased estimator of the population mean. 2-Because they are robust, t procedures are justified in this case. 3- We would use z procedures here, since we are interested in the population mean.
a sample is a sample sized piece given... a sample size is the amount given in one sample
the use of random sampling that results in an unbiased conclusion.
you can not people can be biased and not biased