Fall 2022 BUS.240.MSF1 Data Analysis for Managers

Math 240 Exam 2Name
TRUE/FALSE. Write ‘T’ if the statement is true and ‘F’ if the statement is false.
1) A 90 percent confidence interval will be wider than a 95 percent confidence interval,
ceteris paribus.
2) The Central Limit Theorem says that, if n exceeds 30, the population will be normal.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the
3) The Central Limit Theorem (CLT) implies that:
A) the mean follows the same distribution as the population.
B) the population will be approximately normal if n ≥ 30.
C) the distribution of the mean is approximately normal for large n.
D) repeated samples must be taken to obtain normality.
4) To estimate the average annual expenses of students on books and class materials, a
sample of size 36 is taken. The sample mean is $850 and the sample standard deviation
is $54. A 99 percent confidence interval for the population mean is:
A) $825.48 to $874.52
B) $826.82 to $873.18
C) $823.72 to $876.28
D) $832.36 to $867.64
5) In constructing a 95 percent confidence interval, if you increase n to 4n, the width of
your confidence interval will be (assuming other things remain the same):
A) about 25 percent of its former width.
B) about four times wider.
C) about two times wider.
D) about 50 percent of its former width.
6) Concerning confidence intervals, which statement is most nearly correct?
A) We use the Student’s t distribution when σ is unknown.
B) We should use z instead of t when n is large.
C) We use the Student’s t distribution to narrow the confidence interval.
SHORT ANSWER. Write the word or phrase that best completes each statement or answers the
7) Read the news story below. Using the 95 percent confidence level, what sample 7)
size would be needed to estimate the true proportion of stores selling cigarettes to
minors with an error of ± 3 percent? Explain carefully, showing all steps in your
TRUE/FALSE. Write ‘T’ if the statement is true and ‘F’ if the statement is false.
8) The level of significance refers to the probability of making a Type II error.
9) If we desire α = .10, then a p-value of .13 would lead us to reject the null hypothesis.
10) For a given Ho and level of significance, if you reject the H0 for a one-tailed test, you
would also reject H0 for a two-tailed test.
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the
11) Guidelines for the Jolly Blue Giant Health Insurance Company say that the average
hospitalization for a triple hernia operation should not exceed 30 hours. A diligent
auditor studied records of 16 randomly chosen triple hernia operations at Hackmore
Hospital and found a mean hospital stay of 40 hours with a standard deviation of 20
hours. “Aha!” she cried, “the average stay exceeds the guideline.” At α = .025, the
critical value for a right-tailed test of her hypothesis is:
A) 2.131
B) 1.960
C) 1.645
D) 1.753
12) The level of significance is not:
A) a value between 0 and 1.
B) the chance of accepting a true null hypothesis.
C) the probability of a “false rejection.”
D) the likelihood of rejecting the null hypothesis when it is true.
13) Dullco Manufacturing claims that its alkaline batteries last at least 40 hours on average
in a certain type of portable CD player. But tests on a random sample of 18 batteries
from a day’s large production run showed a mean battery life of 37.8 hours with a
standard deviation of 5.4 hours. To test DullCo’s hypothesis, the test statistic is:
A) -1.980
B) -1.960
C) -1.728
D) -2.101
14) For a sample size of n = 100, and σ = 10, we want to test the hypothesis H0: µ = 100.
The sample mean is 103. The test statistic is:
A) 0.300
B) 3.000
C) 1.645
D) 1.960
15) Which of the following is not a valid null hypothesis?
A) H0: µ ≠ 0
B) H0: µ = 0
C) H0: µ ≤ 0
D) H0: µ ≥ 0
16) John wants to compare two means. His sample statistics were
equal variances, the pooled variance is:
A) 4.9
B) 3.8
. Assuming
C) 5.1
D) 4.5
17) In a random sample of patient records in Cutter Memorial Hospital, six-month
postoperative exams were given in 90 out of 200 prostatectomy patients, while in
Paymor Hospital such exams were given in 110 out of 200 cases. In comparing these
two proportions, normality of the difference may be assumed because:
A) the samples are random, so the proportions are unbiased estimates.
B) nπ ≥ 10 and n(1 – π) ≥ 10 for each sample taken separately.
C) the probability of success can reasonably be assumed constant.
D) the populations are large enough to be assumed normal.
18) Management of Melodic Kortholt Company compared absenteeism rates in two plants
on the third Monday in November. Of Plant A’s 800 employees, 120 were absent. Of
Plant B’s 1200 employees, 144 were absent. To compare the two proportions, the pooled
proportion is:
A) .140
B) .130
C) .132
D) .135
19) Management of Melodic Kortholt Company compared absenteeism rates in two plants
on the third Monday in November. Of Plant A’s 800 employees, 120 were absent. Of
Plant B’s 1200 employees, 144 were absent. MegaStat’s results for a two-tailed test are
shown below.
The test statistic (shown as z = x.xx) is approximately:
A) 1.942
B) 1.645
C) 2.022
D) 1.960
20) A new policy of “flex hours” is proposed. Random sampling showed that 28 of 50
female workers favored the change, while 22 of 50 male workers favored the change.
Management wonders if there is a difference between the two groups. What is the test
statistic to test for a zero difference in the population proportions?
A) -1.255
B) 1.200
C) 1.321
D) 1.287

Don't use plagiarized sources. Get Your Custom Essay on
Fall 2022 BUS.240.MSF1 Data Analysis for Managers
Just from $13/Page
Order Essay
Achiever Essays
Calculate your paper price
Pages (550 words)
Approximate price: -

Why Work with Us

Top Quality and Well-Researched Papers

We always make sure that writers follow all your instructions precisely. You can choose your academic level: high school, college/university or professional, and we will assign a writer who has a respective degree.

Professional and Experienced Academic Writers

We have a team of professional writers with experience in academic and business writing. Many are native speakers and able to perform any task for which you need help.

Free Unlimited Revisions

If you think we missed something, send your order for a free revision. You have 10 days to submit the order for review after you have received the final document. You can do this yourself after logging into your personal account or by contacting our support.

Prompt Delivery and 100% Money-Back-Guarantee

All papers are always delivered on time. In case we need more time to master your paper, we may contact you regarding the deadline extension. In case you cannot provide us with more time, a 100% refund is guaranteed.

Original & Confidential

We use several writing tools checks to ensure that all documents you receive are free from plagiarism. Our editors carefully review all quotations in the text. We also promise maximum confidentiality in all of our services.

24/7 Customer Support

Our support agents are available 24 hours a day 7 days a week and committed to providing you with the best customer experience. Get in touch whenever you need any assistance.

Try it now!

Calculate the price of your order

Total price:

How it works?

Follow these simple steps to get your paper done

Place your order

Fill in the order form and provide all details of your assignment.

Proceed with the payment

Choose the payment system that suits you most.

Receive the final file

Once your paper is ready, we will email it to you.

Our Services

No need to work on your paper at night. Sleep tight, we will cover your back. We offer all kinds of writing services.


Essay Writing Service

No matter what kind of academic paper you need and how urgent you need it, you are welcome to choose your academic level and the type of your paper at an affordable price. We take care of all your paper needs and give a 24/7 customer care support system.


Admission Essays & Business Writing Help

An admission essay is an essay or other written statement by a candidate, often a potential student enrolling in a college, university, or graduate school. You can be rest assurred that through our service we will write the best admission essay for you.


Editing Support

Our academic writers and editors make the necessary changes to your paper so that it is polished. We also format your document by correctly quoting the sources and creating reference lists in the formats APA, Harvard, MLA, Chicago / Turabian.


Revision Support

If you think your paper could be improved, you can request a review. In this case, your paper will be checked by the writer or assigned to an editor. You can use this option as many times as you see fit. This is free because we want you to be completely satisfied with the service offered.

Live Chat+1(978) 822-0999EmailWhatsApp

Order your essay today and save 20% with the discount code RESEARCH

slot online
seoartvin escortizmir escortelazığ escortbacklink satışbacklink saleseskişehir oto kurtarıcıeskişehir oto kurtarıcıoto çekicibacklink satışbacklink satışıbacklink satışbacklink