For a given set of 12 ranked data values, the sum of the squared differences is 63.18.
What is the test statistic value to test the hypothesis that the rank correlation coefficient
is zero?
A. 0.221
B. 0.673
C. 0.779
D. 0.327
If an average of 12 customers are served per hour, then one customer arrives every
________.
A. 12 minutes
B. 60 minutes
C. 5 minutes
D. 10 minutes
Which symbol represents a test statistic used to test a hypothesis about a population
mean?
A. α
B. β
C. μ
D. z
A recent study focused on the number of times men and women send a Twitter message
in a day. The information is summarized next.
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 p-value for this hypothesis test?
A. 0.0500
B. 0.0164
C. 0.0001
D. 0.0082
In the regression equation, what does the letter “X” represent?
A. The Y-intercept
B. The slope of the line
C. The independent variable
D. The dependent variable
What is the following table called?
A. Histogram
B. Frequency polygon
C. Cumulative frequency distribution
D. Frequency distribution
A contingency table would be used to summarize data such as ________.
A. Company employees by gender and organizational title
B. Company employees by gender and age
C. Company employees by compensation and age
D. Company employees by compensation and years with the company
When the null hypothesis for an ANOVA analysis comparing four treatment means is
rejected, _________________.
A. Two comparisons of treatment means can be made
B. Four comparisons of treatment means can be made
C. Six comparisons of treatment means can be made
D. Eight comparisons of treatment means can be made
Using the following data, the Wilcoxon signed-rank hypothesis test is used to test the
hypothesis that the test results of a treatment after training are greater than the test
results before the treatment. The Wilcoxon critical value is 3 for n = 7 with a 0.05
significance level. What decision should be made regarding the null hypothesis?
A. Reject the null hypothesis and conclude that the “after” is greater than “before.”
B. Reject the null hypothesis and conclude that the “before” is greater than “after.”
C. Fail to reject the null hypothesis.
D. Reject the null hypothesis and conclude that there is no difference between the
“before” and “after.”
Using the following data, the Wilcoxon signed-rank hypothesis test is used to test the
hypothesis that there is no difference between the before and after populations. What
are the sum of the ranks?
A. 4 and 6
B. 5
C. 17
D. 6 and -11
Which one of the following is NOT an example of discrete data?
A. Number of households watching the Home Shopping Network
B. Number of employees reporting in sick
C. Number of miles between New York City and Chicago
D. Number of members of the Denver Lions Club
If a student places in the 99th percentile on an exam, she performed better than 99% of
all students who completed the exam. Her performance is similar to a statement based
on a __________.
A. Frequency table
B. Cumulative frequency distribution
C. Histogram
D. Pie chart
What is the probability that z is between 0.0 and 2.0?
A. 1.0000
B. 0.7408
C. 0.1359
D. 0.4772
A sample of small bottles and their contents has the following weights (in grams): 4, 2,
5, 4, 5, 2, and 6. What is the sample variance of bottle weight?
A. 6.92
B. 4.80
C. 1.96
D. 2.33
In the following set of data: what are the first, second, and third quartiles?
A. 1, 6, and 100
B. 3, 5, and 9
C. 3, 6, and 9
D. 1, 5, and 100
The national sales manager for “I colored this” (ICT) T-shirts provides all salespersons
with the payoff table shown next, giving the estimated profit when a retailer purchases
from one to four dozen T-shirts. The probability of demand for each state of nature is
also shown.
What is the expected payoff for purchasing four dozen T-shirts?
A. 72
B. 120
C. 168
D. 192
What does equal?
A. 640
B. 36
C. 10
D. 120
A survey of an urban university (population of 25,450) showed that 870 of 1,100
students sampled supported a fee increase to fund improvements to the student
recreation center. Using the 95% level of confidence, what is the confidence interval for
the proportion of students supporting the fee increase?
A. [0.767, 0.815]
B. [0.759, 0.822]
C. [0.771, 0.811]
D. [0.714, 0.866]
In a multiple regression analysis, the following correlation matrix was computed.
What does the correlation matrix suggest about the independent variables?
The following data was collected comparing car prices and quantity sold (thousands).
Compute value index to compare car prices in 2010 to 2000.
A silkscreen printing company purchases t-shirts. To ensure the quality of the shipment,
300 t-shirts are randomly selected. Fifteen are defective. What is the 95% confidence
interval for the proportion defective?
Explain the concept of a confidence interval when estimating a population mean.
A probability distribution shows the distribution of a ______________.
A random variable with a Poisson distribution has one of _______ mutually exclusive
values.
If four seasonal indexes are reported for a time series, data is thus reported _________.
Approximately ______% of the observations lies within two standard errors of the
regression line.