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Nationalstandardscallforbloodleadlevelslessthan10g/dLamongchildren.Arandom sample of 28 children from Skid Row Elementary School yielded a sample mean blood lead level of x 13. 3g/dL and a corresponding sample

Nationalstandardscallforbloodleadlevelslessthan10g/dLamongchildren.Arandom sample of 28 children from Skid Row Elementary School yielded a sample mean blood lead level ofx13. 3g/dL and a corresponding sample standard error of 2.6g/dL.

a.Testthenullhypothesis

H0:10g/dL againstHa:10g/dL

at the0. 05 level. Give your test statistic, degrees of freedom, and critical value.

(13points)

b. Computea95%confidenceintervalforthemeanbloodleadlevelofchildren attending Skid Row Elementary.(10 points)

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