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Title: QNT 561 Final Exam Latest Assignment

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QNT 561 Final Exam - Assignment

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1. A random sample of size 15 is selected from a
normal population. The population standard
deviation is unknown. Assume the null hypothesis
indicates a two-tailed test and the researcher
decided to use the 0.10 significance level. For
what values of t will the null hypothesis not be
rejected?
To the left of -1.645 or to the right of 1.645
To the left of -1.345 or to the right of 1.345
Between -1.761 and 1.761
To the left of -1.282 or to the right of 1.282
2. Which of the following is a characteristic of
the F distribution?
Normally distributed
Negatively skewed
Equal to the t-distribution
Positively skewed

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3. For a chi-square test involving a contingency
table, suppose the null hypothesis is rejected.
We conclude that the two variables are
__________.
related
curvilinear
linear
not related
4. A sales manager for an advertising agency
believes that there is a relationship between the
number of contacts that a salesperson makes and
the amount of sales dollars earned. What is the
dependent variable?
sales managers
amount of sales dollars
salesperson
number of contacts
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5. Which of the following is most appropriately
displayed with a frequency table?
What percentage of people prefer Hunt's brand
ketchup
The home location of the most valuable customers
How much explanatory value comes from the study's
variables
The relationship between gender and job
performance
6. The manager of Paul's fruit and vegetable
store is considering the purchase of a new
seedless watermelon from a wholesale distributor.
Since this seedless watermelon costs 4, will
sell for 7, and is highly perishable, he only
expects to sell between six and nine of them.
What is the opportunity loss for purchasing nine
watermelons when the demand is for seven
watermelons?
8
4
12
0
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7. A firm offers routine physical examinations as
part of a health service program for its
employees. The exams showed that 8 of the
employees needed corrective shoes, 15 needed
major dental work, and 3 needed both corrective
shoes and major dental work. What is the
probability that an employee selected at random
will need either corrective shoes or major dental
work?
.25
1.00
.50
.20
8. When data is collected using a qualitative,
nominal variable, what is true about a frequency
distribution that summarizes the data?
The upper and lower class limits must be
calculated.
The number of classes is equal to the number of
variables plus 2.
The 5 to the k rule can be applied.
A pie chart can be used to summarize the data.
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9. If an ANOVA test is conducted and the null
hypothesis is rejected, what does this indicate?
The p-value is less than a.
All population means are different.
At least one pair of population means is
different.
The population means are equal.
10. A random sample of 20 items is selected from
a population. When computing a confidence
interval for the population mean, what number of
degrees of freedom should be used to determine
the appropriate t-value?
25
21
19
20
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11. The question, "Should products be withdrawn
if even one death is associated with its
prescribed use, even if no fault for the tampered
product accrues to the manufacturer?" is an
example of a (n) _____.
strip data mining issue
unresearchable question
ill-defined problem
favored-technique problem
12. A large department store examined a sample of
the 18 credit card sales and recorded the amounts
charged for each of three types of credit cards
MasterCard, Visa, and Discover. Six MasterCard
sales, seven Visa, and five Discover sales were
recorded. The store used an ANOVA to test if the
mean sales for each credit card were equal. What
are the degrees of freedom for the F statistic?
2 in the numerator, 15 in the denominator
6 in the numerator, 15 in the denominator
18 in the numerator, 3 in the denominator
3 in the numerator, 18 in the denominator
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13. A linear trend equation is used to represent
time series values when the data are changing by
equal what?
amounts
percents and proportions
proportions
Percents
14. Which of the following goals should a good
survey instrument accomplish?
Encourage each participant to provide accurate
responses
Encourage participants to be succinct in their
responses
Encourage participants to answer only those
questions they are comfortable answering
Encourage participants to end the survey when
they feel they have contributed enough
information
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15. Kroger, a grocery store chain, wants to
identify the ideal store layout for increasing
store sales. Because it primarily uses two store
designs,one a grid layout with vertical aisles
divided by a center aisle and another using a
traditional straight-aisle pattern,Kroger will
match pairs of stores that have different designs
but similar shopper demographics and location.
Sales from each pair will then be compared to
determine if store design is related to sales.
Which type of study is this an example of?
Exploratory study
Case study
Ex post facto study
Longitudinal study
16. Bones Brothers Associates prepare
individual tax returns. Over prior years, Bones
Brothers has maintained careful records regarding
the time to prepare a return. The mean time to
prepare a return is 90 minutes and the standard
deviation of this distribution is 14 minutes.
Suppose 100 returns from this year are selected
and analyzed regarding the preparation time. What
assumption do you need to make about the shape of
the population distribution of all possible tax
preparation times to make inferences about the
mean time to complete a tax form?
The population distribution is skewed to the
left.
The population distribution is skewed to the
right.
The shape of the population distribution does not
matter.
The population distribution is normal.
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17. Checklists with several items to be
considered by respondents may be subject to
_____.
recency effects
leniency effects
halo effects
primacy effects
18. In a multiple rating list scale, ____.
participants rate multiple items on a 3-point
scale
the participant is restricted to circling their
rating
it is possible to visualize the results better
than with other numerical scales
the data generated are always ordinal
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19. As the size of the sample increases, what
happens to the shape of the distribution of
sample means?
It cannot be predicted in advance
It is positively skewed
It is negatively skewed
It approaches a normal distribution
20. For any chi-square goodness-of-fit test, the
number of degrees of freedom is found by ______.
n k
k -1
n k - 1
n 1
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21. Bank Choice is concerned about stagnating
profits and asks, "How can profitability be
improved?" This is an example of a (n) _____.
research question
measurement question
management question
investigative question
22. A machine is set to fill the small-size
packages of MM candies with 56 candies per bag.
A sample revealed three bags of 56, two bags of
57, one bag of 55, and two bags of 58. To test
the hypothesis that the mean candies per bag is
56, how many degrees of freedom are there?
1
7
9
8
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23. An experimental study is one that _____.
attempts to reveal why or how one variable
produces changes in another
involves manipulation of one or more variables to
determine the effect on another variable
attempts to capture a population's
characteristics by making inferences from a
sample's characteristics and testing resulting
hypotheses
discovers answers to the questions who, what,
when, where, or how much
24. The monthly salaries of a sample of 100
employees were rounded to the nearest 10. They
ranged from a low of 1,040 to a high of 1,720.
If we want to condense the data into seven
classes, what is the most convenient class
interval?
200
50
150
100
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25. Consider a regression analysis, where the
correlation coefficient is 0.18. Then, the
coefficient of determination is _______.
.0324
.36
1.16
.424
26. In multiple regression analysis, when the
independent variables are highly correlated, this
situation is called __________________.
homoscedasticity
curvilinearity
multicollinearity
autocorrelation
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27. Sam's Club installed self-checkout stations
that can track not only member's purchases but
also packaging problems, as the system uses
universal product codes to match the item the
shopper has in their cart with its price and
inventory level in the store, generating a
spreadsheet style report for the researcher. If
you consider the scanner as the tool for
collecting data for Sam's researchers, they are
doing data entry by ____.
spreadsheet
Optical Character Recognition
Field editing
Voice recognition
28. The weekly incomes of a large group of
executives are normally distributed with a mean
of 2,000 and a standard deviation of 100. What
is the z-score for an income of 2,100?
1.683
0.90
2.00
1.00
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29. A ranking scale is a scale that _____.
scores an object without making a direct
comparison to another object
groups participants
groups concepts according to specific criteria
scores an object by making a comparison and
determining order among two or more objects
30. What is the interpretation of a 96
confidence level?
The interval contains 96 of all sample means.
Approximately 96 out of 100 such intervals would
include the true value of the population
parameter.
There's a 96 chance that the given interval
includes the true value of the population
parameter.
There's a 4 chance that the given interval does
not include the true value of the population
parameter.
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