If a data set of 10 observations is used in a multiple regression analysis with 10
independent variables, then ____________.
A. R2 will be equal to 1.0
B. The multiple standard error of the estimate will be 1.0
C. The independent variables will be correlated
D. The regression coefficients will all equal 1.0
For the third quarter, the sales are 1,000 units; the seasonal index for the quarter is 0.85.
What are the deseasonalized sales for the quarter?
A. 1,176
B. 1,000
C. 850
D. 0.15
Consider a two-tailed test with a level of confidence of 99%. The p-value is determined
to be 0.05. Therefore, the null hypothesis ________.
A. should not be rejected
B. must be rejected
C. may or may not be rejected depending on the square root of the sample size
D. is the same as the alternative hypothesis
Refer to the following distribution of ages:
What is the class midpoint of the highest class?
A. 54
B. 55
C. 64
D. 65
A national manufacturer of ball bearings is experimenting with two different processes
for producing precision ball bearings. It is important that the diameters be as close as
possible to an industry standard. The output from each process is sampled and the
average error from the industry standard is measured in millimeters. The results are
presented next.
The researcher is interested in determining whether there is evidence that the two
processes yield different average errors. The population standard deviations are
unknown but are assumed equal. If we test the null hypothesis at the 1% level of
significance, what is the decision?
A. Reject the null hypothesis and conclude the means are different.
B. Reject the null hypothesis and conclude the means are the same.
C. Fail to reject the null hypothesis.
D. Fail to reject the null hypothesis and conclude the means are different.
A maximin strategy will always choose the act or alternative that:
A. maximizes the expected monetary value.
B. minimizes the maximum regret or opportunity loss.
C. maximizes the potential payoff regardless of the state of nature.
D. guarantees a payoff for any state of nature.
What is our decision for a goodness-of-fit test with a computed chi-square value of
1.273 and a critical value of 13.388?
A. Do not reject the null hypothesis.
B. Reject the null hypothesis.
C. Unable to reject or not reject the null hypothesis based on data.
D. We should take a larger sample.
Refer to the following distribution of ages:
For the distribution of ages just shown, what is the relative class frequency for the
lowest class?
A. .50
B. .18
C. .20
D. .10
Which of the following distribution-free tests would not be an example of a
nonparametric method?
A. Sign test
B. t test
C. Kruskal-Wallis test
D. Wilcoxon Signed-rank test
A sample of 100 is selected from a known population of 350 elements. The population
standard deviation is 15. Using the finite correction factor, what is the standard error of
the sample means?
A. 12.6773
B. 0.8452
C. 1.2695
D. Cannot be determined
A sample of 500 students is selected from a known population of 15000 students to
construct a 99% confidence interval for the average SAT score. What correction factor
should be used to compute the standard error?
A. 0.9499
B. 0.9832
C. 2.5760
D. Cannot be determined
A total of 60% of the customers of a fast food chain order a hamburger, French fries,
and a drink. If a random sample of 15 cash register receipts is selected, what is the
probability that 10 or more will show that the above three food items were ordered?
A. 1.000
B. 0.186
C. 0.403
D. 0.000
A group of employees of Unique Services will be surveyed about a new pension plan.
In-depth interviews with each employee selected in the sample will be conducted. The
employees are classified as follows:
What is the probability that the first person selected is either in maintenance or in
secretarial?
A. 0.200
B. 0.015
C. 0.059
D. 0.001
Which statistic is used to test a global hypothesis about a multiple regression equation?
A. t-statistic
B. z-statistic
C. Χ2(chi-square statistic)
D. F
Refer to the following breakdown of responses to a survey of “How confident are you
that you saved enough to retire?”
What percent of the responses indicated that users were very confident?
A. 63%
B. 21%
C. 45%
D. 33%
Suppose we test H0: π1 = π2 at the 0.05 level of significance. If the z-test statistic is
-1.07, what is our decision?
A. Reject the null hypothesis.
B. Do not reject the null hypothesis.
C. Take a larger sample.
D. Reserve judgment.
When testing the null hypothesis that two population proportions are equal, the
hypothesized difference between the population proportions is ________________.
Given a multiple linear regression equation, Ŷ = 5.1 + 2.2X1 – 3.5X2 (assuming other
things are held constant), for a unit increase in the independent variable, X2,
will decrease by _______ units.
Two movie reviewers gave their ratings (0 to 4 stars) to ten movies released this past
month as follows:
The rank order correlation is to be used.
What is the value of ?
Using the following time series data,
The quarterly indexes for the year 2010 will total approximately _______.
In a market research study involving 11 people, 7 preferred Product X, 3 preferred
Product Y, and 1 expressed no preference. A sign test is selected using the 0.05 level of
significance. What is the decision rule if the test statistic is the number of people
preferring Product X?
How are scatter diagrams used to evaluate the assumptions of linear multiple
regression?
The standard error of the estimate measures the scatter or dispersion of the observed
values around a ___________________.
The suggested class interval for a frequency distribution with data ranges from 100 to
220 with 50 observations would be _______.