A sample of teens. A study of the health of teenagers plans to measure theblood

Chapter 0, Problem 11.7

(choose chapter or problem)

A sample of teens. A study of the health of teenagers plans to measure theblood cholesterol level of an SRS of youths aged 13 to 16. The researchers willreport the mean x from their sample as an estimate of the mean cholesterol level in this population.(a) Explain to someone who knows no statistics what it means to say that x is anunbiased estimator of .(b) The sample result x is an unbiased estimator of the population truth nomatter what size SRS the study uses. Explain to someone who knows no statisticswhy a large sample gives more trustworthy results than a small sample.

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