A market researcher is interested in knowing the type of training that works best for
DVD users. Thirty consumers are randomly selected from a population of known DVD
owners (i.e., users). Ten users are trained by giving them the DVD user's manual and
Problem Set 4
The number of arrivals per minute at a bank located in
the central business district of a large city was recorded
over a period of 200 minutes, with the following results:
I really was unsure on what to do for this assignment but then, I go into my
bathroom and my girlfriends has so many different brands of make up it is unreal.
So I gathered data on prices, in which I created a histogram. My histogram displays a
I believe that the media uses a very much so informal way of guessing rather than to
A problem with a telephone line that prevents a
customer from receiving or making calls is upsetting to
both the customer and the telephone company. The file
Phone contains samples of 20 problems reported to two
different offices of a telephone compa
Problem Set 6
If you use a 0.10 level of significance in a two-tail
hypothesis test, what is your decision rule for rejecting a
null hypothesis that the population mean is 500 if you use
the Z test?
Reject H0 i
A simple random sample of n =300 full-time employees
is selected from a company list containing the
names of all N = 5,000 full-time employees in order to
evaluate job satisfaction.
a.Give an example of possible coverage error.
A department was left out o
Problem Set 3
Consider the following contingency table: What is the probability of event
10 + 20
A = AB + AB'
20 + 40
A' = A'B + A'B'
c.A and B?
d.A or B?
Problem Set 2
The Transportation Security Administration reported
that from January 1, 2008, to February 18, 2009, more than
14,000 banned items were collected at Palm Beach International
Airport. The categories were as follows:
November 18, 2015
Chapter 1 Exercises
1.5 The following information is collected from students upon exiting the campus
bookstore during the
first week of classes.
A. Amount of time spent shopping in the bookstore numerical, continuous
B. Number of textboo
One can use here Chi square test of Goodness of Fit.
There are the other substitute normality tests:
1.)D'Agostino's K-squared test
4.)Cramr-von Mises criterion
5.)Lilliefors test for normality
6.1 Your mayor just announced that the local unemployment rate dropped last
month from the prior month. It went from 10.5% to 10.4%. Is this a significant drop?
This is a significant drop especially depending on how many individuals are now
Module 5 DQ 1
You just saw an ad on television that states the majority of the population would vote to make smoking
illegal. The poll that is referenced shows 53% of those asked supported making smoking illegal. In the
fine print at the bottom of the scr
Module 7 DQ 1
Describe when a z-test should be performed as opposed to a t-test? Which (if any) can we use all the
time? Why or why not?
Z-test and t-test are basically the same; they compare between two means to suggest whether both
samples come from the
Face-to-Face Meetings with Individuals E-mails