Stat 257: Solutions to Assignment #3
(3.1) Let X denote the assessed yields, and let Y denote the actual yields. Our goal is to estimate
YT . In addition to the data clearly given in the problem, note
Stat 257: (Selected) Solutions to Assignment #5
(5.2) We begin with the observation that
M
L
M
M
(Yij Y )2 + 2
i=1 j=1
L
L
(Yij Y )(Yik Y ) =
i=1 j<k
(Yij Y )(Yik Y ).
()
i=1 j=1 k=1
The two expressio
Stat 257: Solutions to Assignment #2
(2.1) In order to calculate y, we must pool the averages from each of the two simple random samples
remembering to weight by the appropriate sample sizes. That is,
Stat 257: Solutions to Assignment #4
(4.1) From the data given in the problem, we have N = 235 public libraries which are grouped
into three strata: strata 1 consists of N1 = 74 small libraries, strat