Over the last six months, the following numbers of absences have been reported: 6, 0,
10, 14, 8, and 0. What is the median number of monthly absences?
A. 6
B. 7
C. 8
D. 3
A binomial distribution has 50 trials (n = 50) with a probability of success of 0.50 (Ï€ =
0.50). We would like to find the probability of 34 or more successes using the normal
distribution to approximate the binomial. Applying the continuity correction factor,
what z-score should be used?
A. 2.404
B. 2.546
C. 2.687
D. 0.50
You are assigned to design color codes for different parts. Three colors are used to code
on each part. Once a combination of three colors is used’”such as green, yellow, and
red’”these three colors cannot be rearranged to use as a code for another part. If there
are 35 combinations, how many colors are available?
A. 5
B. 7
C. 9
D. 11
The annual dividend rates for a random sample of 16 companies in three different
industries, utilities, banking, and insurance were recorded. The ANOVA comparing the
mean annual dividend rate among three industries rejected the null hypothesis that the
dividend rates were equal. The mean square error (MSE) was 3.36. The following table
summarized the results:
Based on the comparison between the mean annual dividend rate for companies in
utilities and banking, the 95% confidence interval shows an interval of 1.28 to 6.28 for
the difference. This result indicates that _____________________.
A. there is no significant difference between the two rates
B. the interval contains a difference of 5.00
C. the annual dividend rate in the utilities industry is significantly less than the annual
dividend rate in the banking industry
D. the annual dividend rate in the banking industry is significantly less than the annual
dividend rate in the utilities industry
What is a Type II error?
A. Failing to reject a
A student wanted to construct a 99% confidence interval for the mean age of students in
her statistics class. She randomly selected nine students. Their mean age was 19.1 years
with a sample standard deviation of 1.5 years. What is the 99% confidence interval for
the population mean?
A. [17.42, 20.78]
B. [17.48, 20.72]
C. [14.23, 23.98]
D. [0.44, 3.80]
What test is an appropriate substitute for the ANOVA procedure if the assumptions for
ANOVA cannot be met?
A. z
B. t
C. Rank correlation
D. Kruskal-Wallis
An electronics company wants to compare the quality of their cell phones to the cell
phones from three competitors. They sample 10 phones from each company and count
the number of defects for each phone. If ANOVA was used to compare the average
number of defects, then the treatments would be defined as:
A. the number of cell phones sampled.
B. the average number of defects.
C. the total number of phones.
D. the four companies.
To study the population of consumer perceptions of new technology, sampling of the
population is preferred over surveying the population because _________.
A. sampling is more accurate
B. we can compute z-scores
C. it is quicker
D. sampling methods are simple
A recent study focused on the number of times men and women send a Twitter message
in a day. The sample information is summarized below.
At the .01 significance level, is there a difference in the mean number of times men and
women send a Twitter message in a day? What is the test statistic for this hypothesis?
A. z-statistic
B. t-statistic
C. p-statistic
D. df-statistic
If the correlation between two variables is close to one, the association between the
variables is ___________.
A. Strong
B. Moderate
C. Weak
D. Zero
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 payoff value for the purchase of eight watermelons when the
demand is for seven watermelons?
A. 10
B. 17
C. 24
D. 21
Data for fuel oil and gasoline purchased at wholesale prices for 2006 and 2010 are
shown next.
What is the value index?
A. 116.45
B. 116.71
C. 116.67
D. 131.56
A marketing firm is studying consumer preferences for winter fashions in four different
months. From a population of women 18 to 21 years of age, a random sample of 100
women was selected in January. Another random sample of 100 women was selected in
March. Another random sample of 100 women was selected in June. Another random
sample of 100 women was selected in September. What is the number of samples?
A. 4
B. 100
C. 400
D. 1
For any chi-square goodness-of-fit test, the number of degrees of freedom is found by
______.
A. n – k – 1
B. k – 1
C. n + 1
D. n + k
A company is studying the number of monthly absences among its 125 employees. The
following probability distribution shows the likelihood that people were absent 0, 1, 2,
3, 4, or 5 days last month.
What is the mode of the distribution?
A. 0.72 days
B. 2.5 days
C. 0 days
D. 3 days
In January 2004, the price of coffee was $0.74 per pound. By January 2011, the price of
coffee had increased to $2.63. The simple index is about ______________.
A. 0.48
B. 0.28
C. 355
D. 189
The college of business was interested in comparing the interaction of academic status
and class time on class attendance. Three different classes were sampled for each cell in
the table. The means for each cell follow.
What are the total degrees of freedom?
A. 44
B. 14
C. 4
D. 2
In ANOVA analyses, when the null hypothesis is rejected, we can test for differences
between treatment means by _____________.
A. Constructing confidence intervals
B. Adding another treatment
C. Doing an additional ANOVA
D. Doing a t test
The process used to calculate the probability of an event given additional information
has been obtained through:
A. Bayes’ theorem.
B. classical probability.
C. permutation.
D. subjective probability.
A survey of households in a small town showed that in 850 of 1,200 sampled
households, at least one member attended a town meeting during the year. Using the
99% level of confidence, what is the confidence interval for the proportion of
households represented at a town meeting?
A. [0.674, 0.742]
B. [0.655, 0.705]
C. [0.665, 0.694]
D. [0.679, 0.680]
In a management trainee program, 80% of the trainees are female, while 20% are male.
Ninety percent of the females attended college; 78% of the males attended college. A
management trainee is selected at random. What is the probability that the person
selected is a female who attended college?
A. P (female) P (did not attend college | female)
B. P (did attend college) P (female | did not attend college)
C. P (female) P (did attend college | female)
D. P (did attend college)
Accounting procedures allow a business to evaluate their inventory costs based on two
methods: LIFO (Last In First Out) or FIFO (First In First Out). A manufacturer
evaluated its finished goods inventory (in $000s) for five products with the LIFO and
FIFO methods. To analyze the difference, they computed (FIFO – LIFO) for each
product. Based on the following results, does the LIFO method result in a lower cost of
inventory than the FIFO method?
What is the null hypothesis?
A. H0: d = 0
B. H0: d ≠0
C. H0: d ≤ 0
D. H0: d ≥ 0
Twenty-one executives in a large corporation were randomly selected to study the effect
of several factors on annual salary (expressed in $000s). The factors selected were age,
seniority, years of college, number of company divisions they had been exposed, to and
the level of their responsibility. The results of the regression analysis follow:
Which one of the following is the dependent variable?
A. Age
B. Seniority
C. Level of responsibility
D. Annual salary
A disadvantage of using an arithmetic mean to summarize a set of data is that
__________.
A. The arithmetic mean sometimes has two values
B. It can be used for interval and ratio data
C. It is always different from the median
D. It can be biased by one or two extremely small or large values
A Pareto chart is typically skewed to the ________________.
In multiple regression, the ________ is used to test the global hypothesis.
The ______________ is used to measure the relative symmetry of a distribution.
The Sea Mist Hotel collects customer satisfaction data daily. Yesterday, the hotel was
99% occupied and the manager wanted to quickly assess customer satisfaction. She
randomly selected 10 scores. The maximum score is 100 points. The mean score is
82.1. The 10 scores were:
What is the standard deviation?
When the null hypothesis is rejected based on the Durbin-Watson statistic, what types
of problems occur in regression analysis?
There are 10 flights from Minneapolis to St. Cloud each day. The probability that any
one flight is late is 0.05. Using the binomial probability formula, what is the probability
that 1 or more are late?
The coefficient of correlation and the slope of the regression line always have their
__________ in common.
After arriving at the university student medical clinic, the waiting times to receive
service after checking-in follow an exponential distribution with a mean of 10 minutes.
How many students are served per hour?
A small manufacturing company with 52 employees has annual salaries distributed such
that the mean is $25,459, the median is $24,798 and the mode is $24,000. An additional
foreman is hired at an annual salary of $50,700. The measure of central location that is
affected by the addition of this salary is called the _________________.
After arriving at the university student medical clinic, the waiting times to receive
service after checking-in follow an exponential distribution with a mean of 10 minutes.
Calculate the probability a student waits less than 6 minutes.