Statistics 160 Fall 2008 Midterm #1 Solutions
1. (a) The explanatory variable is year and the response variable is population.
1. (b) Since r2 = 0.9770393 is the square of the correlation, we know that
r
0.9770393, 0.9770393 = cfw_0.988453, 0.988453.
Howe
STAT 160 Handout-8
Probability and Probability Distributions
Discrete Random Variables and their probability Distributions
A quantitative variable x is a random variable if the value that it assumes, corresponding
to the outcome of an experiment, is a ch
Statistics 160Introductory Statistics
Fall 2008 (200830)
Final Exam Solutions
Instructor: Michael Kozdron
1. (A) The researchers suspect that lakes with lower pH have fewer species of sh. Since they want
to investigate the relationship between two variabl
Stat 160 Fall 2008
Solutions to Assignment #6
11.32
As noted in the rst box on page 278, the mean and standard deviation of x are and / n,
respectively. If the heights of young men have standard deviation 2.8 inches, then the sample
mean of a SRS of n you
Stat 160 Fall 2008
(Brief) Solutions to Assignment #5
10.8 (a) Yes, since (i) all probabilities are between 0 and 1, and (ii) their sum is 1.
10.8 (b) 0.20 + 0.15 = 0.35
10.9 (a) The ? should be replaced by 0.11 since the sum of all probabilities must be
Stat 160 Fall 2008
Solutions to Assignment #4
1. (a) In this problem, year is the explanatory variable and population is the response variable.
Hence, if we denote year by x, then
x=
1952 + 1962 + 1972 + 1982 + 1992 + 2002
= 1977
6
and
(1952 1977)2 + + (2
Make sure that this examination has 12 numbered pages
University of Regina
Department of Mathematics & Statistics
Final Examination
200830
(December 16, 2008)
Statistics 160
Introductory Statistics
Name:
Student Number:
Instructor: Michael Kozdron
Time: 3
Stat 160 Fall 2008
Solutions to Assignment #7
14.21
A 99% condence interval for , the true mean BSRI masculinity score among male hotel
managers, is given by
0.79
x z = 5.91 2.576
= [5.743, 6.077].
n
148
14.22
A 90% condence interval for , the true mean
Stat 160 Fall 2008
Solutions to Assignment #9
22.40 (a) The basic design is as follows. The 16 pieces of identical fabric were randomly assigned to
one of two groups with 8 pieces of fabric in each group. Each piece of fabric in the rst group
was dyed by
Statistics 160 Midterm #2 November 20, 2008
This exam has 14 problems on 8 numbered pages and is worth a total of 60
points.
You have 75 minutes to complete this exam. Please read all instructions carefully, and check
your answers. Show all work neatly an
Statistics 160 Midterm #1 October 7, 2008
This exam has 11 problems on 8 numbered pages and is worth a total of 60
points.
You have 75 minutes to complete this exam. Please read all instructions carefully, and check
your answers. Show all work neatly and
Statistics 160 Fall 2008 Midterm #2 Solutions
1. (a) If X denotes the number of teenagers who use instant messaging online and n denotes
the number of teenagers sampled, then an estimate of the true proportion of teenagers
who use instant messaging online
Stat 160 Fall 2008
Solutions to Assignment #10
23.16 (a) Let pj denote the proportion of births on the j th day of the week (with Sunday corresponding
to day 1). If all days were equally likely, we would have p1 = p2 = = p7 = 1/7 so that the
null hypothes
Mission:
Conduct research on peer-to peer market trends, and present findings to product
managers in developing SGI CANADAs personal property and auto products.
Product Mode Description: P2P Insurance will be a decentralized communications
model which eit