Sampling variation is caused by A. systematic errors in our procedure. B. random

Question

Sampling variation is caused by

A. systematic errors in our procedure.
B. random selection of a sample.
C. changes in a population parameter from sample to sample.
D. changes in a population parameter that cannot be predicted.

(b) A statistic is said to be unbiased if

A. the mean of its sampling distribution is equal to the true value of the parameter being estimated.
B. both the person who calculated the statistic and the subjects whose responses make up the statistic were truthful.
C. the survey used to obtain the statistic was designed so as to avoid even the hint of racial or sexual prejudice.
D. it is used for only honest purposes.

(c) The sampling distribution of a statistic is

A. the extent to which the sample results differ systematically from the truth.
B. the mechanism that determines whether or not randomization was effective.
C. the probability that we obtain the statistic in repeated random samples.
D. the population consisting of all the possible values of the statistic that might be observed based on all possible samples of a given size.

Explanation / Answer

1) Sampling variation is caused by:

B. random selection of a sample.

2) A statistic is said to be unbiased if

A. the mean of its sampling distribution is equal to the true value of the parameter being estimated.

3)The sampling distribution of a statistic is

D. the population consisting of all the possible values of the statistic that might be observed based on all possible samples of a given size.

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