Question: Question #3 (both 454 & 854 - 10 points): We saw in class how to use SAS to compute y and under SRS and

Question #3 (both 454 & 854 - 10 points): We saw in

Question #3 (both 454 & 854 - 10 points): We saw in class how to use SAS to compute y and under SRS and STSRS. We also saw how to use use SAS to compute VSRS (A), VSRS(A), VSTSRS(A) and VSTSRS (A). However, SAS must be able to compute and A, as well as their corresponding variance estimators, under more sampling designs that just SRS and STSRS. Hence, SURVEYMEANS uses more general formulas than the ones given in class. However, these more general formulas simplify to the ones given in class, and this question is concerned with proving this. SAS must also be able to perform calculations under two-stage or cluster sampling, something that we will discuss later in STAT 454/854. Looking at the online help for SURVEYMEANS, the general formulas for YSAS and tsas (and their corresponding variance estimators) involve triple sums. In the context of this question, these triple sum formulas simplify to the following. The SAS formula for estimating a population mean yu is given by H nh 1 YSAS W.. whi Whi h=1 i=1 where The variances estimator of SAS is given by where W.. = H VSAS(SAS) = h=1 H nh - h=1 i=1 Whi - nh(1 nh/Nh) nh-1 nh i=1 (Chi - h.) nh 1 Whi Chi (Yhi - YSAS) and Ch. nh IM Chi i=1 W.. The SAS formula for estimating a population total tu is given by H nh tsas = wnt Whi The variances estimator of tsAs is given by h=1 i=1 where H VSAS (SAS) = h=1 nh(1 nh/Nh) nh-1 nh (em - elia)2 i=1 nh 1 eni = Whi Yhi and ehi nh Using the above formulas and the ones given in class show that: (a) SAS simplifies to is under SRS Assign #1 STAT 454/854 (W2024) (b) VSAS(SAS) simplifies to srs(s) under SRS (c) SAS simplifies to under STSRS (d) VSAS(SAS) simplifies to VSTSRS() under STSRS (e) tsas simplifies to = Nys under SRS (f) VSAs (sas) simplifies to VSRS (t) under SRS (g) tsas simplifies to under STSRS (h) Vsas (sas) simplifies to VSTSRS (^) under STSRS. i=1 3 of 8

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