Question: Many sample surveys use well-designed random samples but half or more of the original sample cant be contacted or refuse to take part. Any errors

Many sample surveys use well-designed random samples but half or more of the original sample can’t be contacted or refuse to take part. Any errors due to this nonresponse

(a) have no effect on the accuracy of confidence intervals.

(b) are included in the announced margin of error.

(c) are in addition to the random variation accounted for by the announced margin of error.

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