For the domain sampling model described in Section10.4.1, show (a) If (operatorname{Var}left(y_{k} ight)=sigma^{2}) is a constant, the

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For the domain sampling model described in Section10.4.1, show

(a) If \(\operatorname{Var}\left(y_{k}\right)=\sigma^{2}\) is a constant, the Spearman-Brown \(ho_{K}\) and Cronbach coefficient alpha \(\alpha_{K}\) are identical;

(b) If \(\operatorname{Cov}\left(y_{k}, y_{l}\right) \geq c>0\) for all \(1 \leq k, l \leq K\), then \(\lim _{K \rightarrow \infty} \alpha_{K}=1\);

(c) Choose a setting where \(\sigma_{k}^{2}=\operatorname{Var}\left(y_{k}\right)\) is a function of \(k\) and compare the estimates of \(ho_{K}\) and \(\alpha_{K}\) using Monte Carlo simulation with a sample size 5,000.

Section 10.4.1

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