Stat 257.01 Fall 2004
Assignment #2 (Selected) Solutions
(3.2) Since the forester wants to estimate the total number of trees on a tree farm, and since a
map of the farm is available, we can assume th
Statistics 257 Midterm October 25, 2004 (Selected Solutions)
1. (b) We see that N1 = 51, N2 = 33, N3 = 35, N4 = 55, N5 = 36, N6 = 53, and N7 = 52
so that N = 315. We also compute that
y1 =
80
72
108
1
Stat 257.01 Fall 2004
Assignment #3 (Selected) Solutions
(3.30) Very briey:
(a) As noted in exercise 3.28, there were 9965 teenagers aged 1218 years old and living in
households who were randomly sele
Stat 257.01 Fall 2004
Assignment #1 Solutions
(2.1) There are two denitions of statistics that are possible here. A statistic is simply a
number computed from data; for example, the sample mean or sam
Stat 257.01 Fall 2004
Assignment #4 Solutions
(4.10) An estimate of the proportion of students on campus in favour of converting from the
semester system to the quarter system is simply the ratio of t
Statistics 257Applied Survey Techniques
Fall 2004 (200430)
Final Exam Solutions
Instructor: Michael Kozdron
1.
As in Denition 4.1 on page 79, a simple random sample of size n from a population of
size
Stat 257.01 Fall 2004
Assignment #5 Solutions
(5.1) We begin by computing pi from the given data:
p1 =
4
0.286
14
p2 =
2
0.222
9
p3 =
8
0.381
21
p4 =
1
0.167.
6
We can now use equation (5.13) to d
Stat 257.01 Fall 2004
Assignment #10 (Selected) Solutions
(11.2) In this case, we see that the technique of interpenetrating subsamples was used. Let the
index i denote the ith interviewer, i = 1, . .
Stat 257.01 Fall 2004
Assignment #8 Solutions
(6.25) As noted, each brand serves as a strata. In order to use consistent notation with the
text, we will write strata A for brand I and strata B for bra
Stat 257.01 Fall 2004
Assignment #9 (Selected) Solutions
(8.2) We let saws in industry i denote the ith cluster, so that the cluster sizes mi , i = 1, . . . 20,
are given by the number of saws column,
Stat 257.01 Fall 2004
Assignment #7 Solutions
(6.8) There was a misprint in this problem in earlier editions of the text. The earlier editions
had y = 169 while the corrected editions have y = 2.6. If
Stat 257.01 Fall 2004
Assignment #6 (Selected) Solutions
(2.7) (a) The mean is a good summary number for typical calories per serving for these drinks.
As such, the standard deviation is a good summar