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The Sampling Dist

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QuestionAnswer
In statistics, what is a population? Ex. We are studying the GPA of incoming freshmen at Harvard. What is the population? the total set of observations that can be made Ex. Ans. The GPAs of all incoming freshmen at Harvard
What is a parameter? Ex. We are studying the GPA of incoming freshmen at Harvard. What is the parameter? a measurable characteristic of a population Ex. Ans. The true mean of the GPAs of all incoming freshmen at Harvard.
What is a sample? Ex. We are studying the GPA of incoming freshmen at Harvard. What is a sample? a set of observations drawn from a population Ex. Ans. A sample would be 40 out of all of the GPAs of all incoming freshmen at Harvard
What is a statistic? Ex. We are studying the GPA of incoming freshmen at Harvard. What is a statistic? a characteristic of a sample. Generally, a statistic is used to estimate the value of a population parameter Ex. Ans. A statistic would be the mean GPA of 40 of the incoming freshmen at Harvard.
What is an unbiased estimator? An unbiased estimator is when the mean of the statistic's sampling distribution is equal to the population's parameter.
How do you avoid bias in sampling? by using random sampling methods
How do you reduce variability in sampling? by increasing the size of the random sample
What is the sampling distribution of the statistic? The distribution of the statistic value in all possible samples of the same size from the same population
Created by: donnawiles3