STATISTICS FOR BUSINESS CONTROL
HOMEWORK 3, SOLUTIONS
Peter Lakner
1. You are considering a quality inspection scheme to use on the spark plugs which are
sent from your supplier. These spark plugs come in a shipments of 50,000. Denote the
unknown proporti

STATISTICS FOR BUSINESS CONTROL
MIDTERM TEST, 2011 FALL, SOLUTIONS
VERSION B
Peter Lakner
1.a Let X be the volume of drink contained in a randomly selected bottle.
P (X > 20.6) = P Z >
20.6 20
.5
= P (Z > 1.2) = .5 .3849 = .1151
1.b Let w be the unknown v

STATISTICS FOR BUSINESS CONTROL
MIDTERM TEST, 2011 FALL, SOLUTIONS
VERSION A
Peter Lakner
1. Let S be the event that a randomly selected customer buys a shirt and T be the event
that a randomly selected customer buys a tie. The complementers of these two

HOMEWORK 2, SOLUTIONS
STATISTICS FOR BUSINESS CONTROL
Peter Lakner
1. John, Kathy, Len, and Marta are the nal quality inspectors for computer monitors. If
a computer monitor functions properly, then
John will say OK with probability 0.92
Kathy will say OK

STATISTICS FOR BUSINESS CONTROL
PRACTICE MIDTERM TEST
2011 FALL Peter Lakner
This is an open book exam. It has 5 problems on two pages. Please verify that you have
both pages of the exam. Use the probability tables in the lecture notes or in the textbook.

STATISTICS FOR BUSINESS CONTROL
HOMEWORK 5, SOLUTIONS
Peter Lakner
1. The quality control section of a purchasing contract for valves species that the diameter
must be between 2.53 and 2.57 centimeters. Assume that the production equipment is set
so that

STATISTICS FOR BUSINESS CONTROL
PRACTICE MIDTERM TEST, 2011 FALL, SOLUTIONS
Peter Lakner
1.(a) Here is the probability table:
Single Married Total
Men
Women
Total
.25
.04
.29
.55
.16
.71
.8
.2
1
Explanation: the .25 gure comes out as
P (man and single) =

STATISTICS FOR BUSINESS CONTROL
PRACTICE FINAL EXAM, 2011 FALL
Peter Lakner
1.
(a) An agency wants to estimate the proportion of people in a large town who oppose
allowing the construction of additional housing units. How large sample is needed in
order t

STATISTICS FOR BUSINESS CONTROL, STAT-UB.0001.01
Peter Lakner
1
1 Data summary
Qualitative data consists of qualities.
Ordinal qualitative data: if there is a natural order amongst the appearing qualities in the
list. For example, strongly disagree, disgr

STATISTICS FOR BUSINESS CONTROL
HOMEWORK 9, SOLUTIONS
Peter Lakner
1. a. The null-hypothesis is that the average age of the population of customers is the
same as that of the population in town, 43.1 years. The alternative (research) hypothesis
is that th

HOMEWORK 6, SOLUTIONS
Statistics for Business Control
Peter Lakner
1: Bluesh purchased at the Lime Beach Fishing Terminal produce a let weight which
has a mean of 4.5 pounds with a standard deviation of 0.8 pound. If you purchase ve
such sh, then what is