Considertheconfidenceinterval(6.8)for E(Y ) in thebivariatemodel. (a) Showthatat x0 = x, theintervalis the sameastheinterval y t~2,n1(s~

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Considertheconfidenceinterval(6.8)for E(Y ) in thebivariatemodel.

(a) Showthatat x0 = x, theintervalis the sameastheinterval y ± tα~2,n−1(s~

º

n) in the formula(4.10)forthe marginal distributionof y, exceptforthe t quantilescore.

(b) At x0 ≠ x, explainwhyyou can estimate E(Y ) more preciselywhen {xi} are morespread out.

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