________ probability is used when we know the number of possible outcomes of the
event of interest and the total number of possible outcomes in the sample space.
A) Empirical
B) Simple
C) Subjective
D) Classical
The following data represent the number of sweatshirts sold for each of the past six
days for Hoys Department Store at the beach in Avalon, New Jersey.
Using a three-period weighted moving average with weights 5, 2, and 1, the mean
absolute deviation is ________.
A) 3.2
B) 4.8
C) 7.8
D) 9.3
Consider the partially completed one-way ANOVA summary table.
The F-test statistic for this ANOVA procedure is ________.
A) 2.2
B) 3.0
C) 5.5
D) 7.4
A manager of an electronics store would like to investigate the impact that price has on
the demand for laptop computers. Each week, the price of a Dell laptop is adjusted and
the demand for each week is recorded. This is an example of an experiment being used
to collect data.
Consider the partially completed two-way ANOVA summary table.
The mean sum of squares for interaction of Factors A and B for this ANOVA procedure
is _____.
A) 24
B) 50
C) 65
D) 75
The Wall Street Journal reported that the average amount of time that a French person
spends eating lunch at a restaurant is 22 minutes. Perform a hypothesis test to determine
if a difference exists between the average time an American spends eating lunch when
compared to a person from France. The following data represents the time, in minutes,
that random French and American diners spent at lunch. Assume that the population
variances are equal.
If Population 1 is defined as French diners and Population 2 is defined as American
diners, the p-value for this hypothesis test would be between ________.
A) 0.01 and 0.025
B) 0.025 and 0.05
C) 0.05 and 0.10
D) 0.10 and 0.20
Periodicity is present in the population when
A) the population can be divided into mutually exclusive groups.
B) the population cannot be divided into mutually exclusive groups.
C) there is a pattern in the sample consistent with the value of k that is chosen in cluster
sampling.
D) there is a pattern in the population consistent with the value of k that is chosen in
systematic sampling.
Use the following information to answer the question(s) below.
A home appraisal company would like to develop a regression model that would predict
the selling price of a house based on the age of the house in years (Age), the living area
of the house in square feet (Living Area) and the number of bedrooms (Bedrooms). The
following Excel output shows the partially completed regression output from a random
sample of homes that have recently sold.
The 95% confidence interval for the regression coefficient for the Age variable is
________.
A) (-181, -981)
B) (-3,181, 2,019)
C) (-2,580, 1,419)
D) (-5,186, 4,025)
Breyers is a major producer of ice cream and would like to test the hypothesis that the
average American consumes more than 17 ounces if ice cream per month. A random
sample of 15 Americans was found to consume an average of 18.2 ounces of ice cream
last month. The standard deviation for this sample was 3.9 ounces. Breyers would like
to set α = 0.10. The p-value for this hypothesis test would be between ________.
A) 0.01 and 0.02
B) 0.02 and 0.05
C) 0.05 and 0.10
D) 0.10 and 0.20
The Affordable Care Act is a healthcare reform bill that President Obama signed into
law on March 23, 2010. This bill is also known as “ObamaCare”. A recent survey
conducted by Jackson & Coker found that only 13% of doctors support this legislation.
To validate these findings, a random sample of 300 doctors was asked if they support
the Affordable Care Act. A total of 54 doctors from this sample responded that they
supported this bill. Which of the following statements is correct?
A) The interval that contains 95% of the sample proportions is 0.092 and 0.168.
Because the sample proportion is between these two values, we have support for the
results of the Jackson & Coker survey.
B) The interval that contains 95% of the sample proportions is 0.092 and 0.168.
Because the sample proportion is not between these two values, we do not have support
for the results of the Jackson & Coker survey.
C) The interval that contains 95% of the sample proportions is 0.064 and 0.196.
Because the sample proportion is between these two values, we have support for the
results of the Jackson & Coker survey.
D) The interval that contains 95% of the sample proportions is 0.064 and 0.196.
Because the sample proportion is not between these two values, we do not have support
for the results of the Jackson & Coker survey.
A local grocery store receives strawberries from suppliers in Florida and California.
Currently there are 18 strawberry containers on the shelf and 11 of them are from
Florida. A shopper selects three containers to purchase. What is the probability that two
or more containers are from the Florida supplier?
Use the following information to answer the question(s) below.
Ford would like to develop a regression model that would predict the number of cars
sold per month by a dealership employee based on the employee’s number of years of
sales experience (Exp), the employee’s weekly base salary before commissions (Salary),
and the education level of the employee. There are three levels of education in the sales
forcehigh school degree, associate’s degree, and bachelor’s degree. The following
dummy variables have been defined.
The following Excel output shows the partially completed regression output from a
random sample of employees from the previous month.
The critical value for the hypothesis test for the overall regression model using α = 0.05
is ________.
A) 2.104
B) 2.866
C) 3.982
D) 8.763
Your cell phone number is an example of quantitative data.
A ________ represents all possible subjects of interest.
A) sample
B) population
C) statistic
D) parameter
An NCAA study reported that the average salary of the 300 major college football
coaches is $1.47 million. Using a random sample of 30 coaches and a population
standard deviation of $300,000, what is the probability that the sample mean is between
$1.4 million and $1.5 million per year?
A) 0.6829
B) 0.7754
C) 0.8660
D) 0.9159
Suppose Apple would like to test the hypothesis that the standard deviation for the web
browsing battery life of the iPad equals 3.0 hours. The following data represents the
battery life, in hours, experienced by a random sample of six users.
The degrees of freedom for this hypothesis test would be ________.
A) 4
B) 5
C) 6
D) 7
Expedia would like to test the hypothesis that the average roundtrip airfare between
Philadelphia and Paris is higher for a flight originating in Philadelphia when compared
to a flight originating in Paris. The following data summarizes the sample statistics for
roundtrip flights originating in both cities. Assume that the population variances are
equal.
If Population 1 is defined as flights originating in Philadelphia and Population 2 is
defined as flights originating in Paris, the p-value for this hypothesis test would be
between ________.
A) 0.005 and 0.01
B) 0.01 and 0.025
C) 0.025 and 0.05
D) 0.05 and 0.10
A respondent of a survey indicates that she is currently in her junior year at the
University of Texas. This is an example of _________ data.
A) nominal
B) ordinal
C) interval
D) ratio
AT&T would like to investigate if brand of smartphone and income level are
independent variables. The following contingency table shows the number of customers
who own three brands of smartphones along with their income level.
The test statistic for this sample is ________.
A) 2.912
B) 3.550
C) 11.746
D) 13.210
The federal government would like to test the hypothesis that the average age of men
filing for Social Security is higher than the average age of women set using α = 0.05
with the following data:
If Population 1 is defined as men and Population 2 is defined as women, the correct
hypothesis statement for this hypothesis test would be
_______________________________.
A)
B)
C)
D)
The test statistic for the one-tail Wilcoxon signed-rank test is the _________________.
A) smaller of the sum of the negative signed ranks (R-) and the sum of the positive
signed ranks (R+).
B) larger of the sum of the negative signed ranks (R-) and the sum of the positive
signed ranks (R+).
C) sum of the positive signed ranks (R+)
D) sum of the negative signed ranks (R-)
According to the Deloitte EV Survey, 5% of respondents indicated that they would be
willing to pay an extra $500 or more for an electric vehicle versus one with a gasoline
engine. A random sample of 25 adults has been selected. Use the Poisson distribution to
approximate the binomial distribution to determine the probability that exactly one
adult from this sample would be willing to pay an extra $500 or more for an electric
vehicle versus one with a gasoline engine.
A) 0.0689
B) 0.1104
C) 0.3581
D) 0.4852
A data set has 60 observations with a minimum value equal to 30 and a maximum value
equal to 72. The number of classes using the rule is
A) 5.
B) 6.
C) 7.
D) 8.
Use the information below to answer the following question(s).
A snack food producer is considering introducing a new product to the consumer
market. It can choose to build a new facility for production of the new product, use an
existing facility, or outsource the production to another company. The company
estimates that the probability of strong demand for this product to be 65% and the
probability of weak demand is estimated at 35%. The company also has the option to
hire a marketing research firm to conduct a study to provide additional information
about the demand that has the following track record:
•Historically, this research firm has predicted a strong demand when the eventual
demand was strong 80% of the time.
•Historically, this research firm has predicted a weak demand when the eventual
demand was weak 85% of the time.
Given that the survey predicts a strong demand, the probability that the eventual demand is
strong is ________.
A) 0.776
B) 0.817
C) 0.855
D) 0.908
A manufacturer of smartphone batteries will randomly select 20 batteries from the
process each day and count the number of defects. Historically, 4% of the batteries
produced by this company have been defective. The following data represent the
frequency of defective batteries from a random sample of 200 days.
The manufacturer would like to test if the probability distribution for defective batteries
follows the binomial distribution with p = 0.04 and n = 20 using α = 0.05. The critical
value for this hypothesis test is ________.
A) 5.991
B) 7.815
C) 9.448
D) 11.070
The federal government would like to test the hypothesis that the average age of men
filing for Social Security is higher than the average age of women set using α = 0.05
with the following data:
If Population 1 is defined as men and Population 2 is defined as women, the 90%
confidence interval for the difference in population means is ________.
A) (0.75, 1.05)
B) (“1.37, 3.17)
C) (0.52, 1.28)
D) (“0.34, 2.14)
According to the Bureau of Labor Statistics, 7.1% of the labor force was recently
unemployed. A random sample of 100 employable adults was selected. Using the
normal approximation to the binomial distribution, what is the probability that exactly 8
people from this sample are unemployed?
A) 0.0681
B) 0.1452
C) 0.3512
D) 0.4333
The ________ frequencies refer to the sample data collected from a population of
interest when performing a hypothesis test comparing two or more population
proportions.
A) relative
B) expected
C) cumulative
D) observed
________ is (are) derived from facts for the purpose of making decisions.
A) Data
B) Information
C) Statistics
D) Samples
DLP projectors are used in the majority of cinema projection systems and require a
special light bulb to display a picture. Assume that the average life of a DLP bulb is
2,000 hours and that this failure time follows the exponential distribution. What is the
probability that a randomly selected bulb will last between 1,500 and 2,200 hours?
A) 0.1395
B) 0.1956
C) 0.2530
D) 0.3648
You have been assigned to test the hypothesis that the variability for the number of
hours per week that an American works is equal to the variability for the number of
hours per week that a Swede works. The following data summarizes the sample
statistics for the number of hours worked per week for workers in each country.
The test statistic for this hypothesis test would be ________.
A) 2.73
B) 3.05
C) 3.67
D) 4.33
The Department of Housing and Urban Development (HUD) would like to test the
hypothesis that the average size of a newly constructed house last year is different from
the average size of a newly constructed house in 2000. The following data summarizes
the sample statistics for house sizes, in square feet, for both years. Assume that the
population variances are equal.
If Population 1 is defined as homes built in 2000 and Population 2 is defined as homes
built last year, the 90% confidence interval for the difference in population means is
________.
A) (68.1, “408.1)
B) (17.0, “357.0)
C) (“26.2, “313.8)
D) (“127.5, “212.5)
If there is interest in testing the significance of the blocking factor in a randomized
block ANOAV design, you should _________________________.
A) perform a one-way ANOVA treating the blocking factor as the main factor
B) perform a randomized block ANOVA treating the blocking factor as the main factor
C) perform a two-way ANOVA treating the blocking factor as one of the main factors
D) perform a two-way ANOVA and test for interaction between the main and blocking
factors
Entertainment Software Association would like to test if the median age of “gamers”
(those that routinely play video games) is more than 30 years old. The following table
summarizes the ages of a random sample of gamers.
The appropriate nonparametric procedure for this analysis is the _________________
test.
A) Wilcoxon signed-rank
B) Kruskal-Wallis
C) Wilcoxon rank-sum
D) sign
Use the following information to answer the question(s) below.
Ford would like to develop a regression model that would predict the number of cars
sold per month by a dealership employee based on the employee’s number of years of
sales experience (Exp), the employee’s weekly base salary before commissions (Salary),
and the education level of the employee. There are three levels of education in the sales
forcehigh school degree, associate’s degree, and bachelor’s degree. The following
dummy variables have been defined.
The following Excel output shows the partially completed regression output from a
random sample of employees from the previous month.
The sum of squares regression for this regression model is ________.
A) 60.23
B) 267.61
C) 327.84
D) 410.25