The multiple coefficient of determination, R2, reports the proportion of the variation in
Y that is not explained by the variation in the set of independent variables.
The alternative hypothesis used in ANOVA is H1: All population means are equal.
Within plus and minus one standard deviation of the mean, the area under any normal
curve is about 68%.
A stem-and-leaf display includes the following row: 3 | 0 1 3 5 7 9. Assume that the
data is rounded to the nearest whole number. Which of the following statements is
The claim that “male and female students at Coastal Carolina University prefer different
parking lots on campus” is an example of a chi-square null hypothesis.
Hypothesis testing is a procedure that uses sample evidence and probability theory to
decide whether to reject or fail to reject a hypothesis.
The items or individuals of the population are arranged in a file drawer alphabetically
by date received. A random starting point is selected and then every kth member of the
population is selected for the sample. This sampling method is called systematic
random sampling.
When data is collected using a qualitative, nominal variable (in other words, male or
female), what is
The standard error of the mean is directly related to the sample size.
A t-statistic is useful for computing an expected normal distribution.
The alternate hypothesis can be accepted only if the null hypothesis is shown to be
_________.
The probability of rolling a 3 or 2 on a single die is an example of conditional
probability.
When dependent samples are used to test for differences in the means, we pool the
sample variances.
For a contingency table, the expected frequency for a cell is found by dividing the row
total by the grand total.
The number of different standard normal distributions is unlimited.
If the correlation coefficient has a negative value, then the coefficient of determination:
A. can take on either a negative or positive value.
B. must be positive.
C. will also have a negative value.
D. will equal zero.
For a two-tailed test with a 0.05 significance level, where is the rejection region when n
is large and the population standard deviation is known?
A. Between 1.960
B. Between 1.645
C. Greater than +1.960 and less than -1.960
D. Greater than +1.645 and less than -1.645
A manufacturer of automobile transmissions uses two different processes. Management
ordered a study of the production costs to see if there is a difference between the two
processes. A summary of the findings is shown next.
What is the critical value of F at the 1% level of significance?
A. 9.46
B. 8.29
C. 8.18
D. 4.61
A method of assigning probabilities based upon judgment, opinions, and available
information is referred to as the:
A. empirical method
B. probability method
C. classical method
D. subjective method
The mean of a normal distribution is 400 pounds. The standard deviation is 10 pounds.
What is the probability of a weight between 415 pounds and the mean of 400 pounds?
A. 0.5000
B. 0.1932
C. 0.4332
D. 0.3413
A nonparametric equivalent of a version of the ANOVA test, which tests the hypothesis
that several population means are equal is known as the:
A. Wilcoxon ranked-sum test
B. Spearman’s coefficient of rank correlation
C. Kruskal-Wallis test
D. Sign test
A recent study of the relationship between social activity and education for a sample of
corporate executives showed the following results.
Based on the analysis, what can be concluded?
A. Social activity and education are correlated.
B. Social activity and education are not related.
C. Social activity and education are related.
D. No conclusion is possible.
An F statistic is __________.
A. A ratio of two means
B. A ratio of two variances
C. The difference between three means
D. A population parameter
The same mean:
A. Is always equal to the population mean.
B. Is always smaller than the population mean.
C. Is found by adding the data values and dividing them by (n-1).
D. Is found by adding all data values and dividing them by n.
In the past five years, 45% of the tourists who visited Orlando, Florida, went to see
local attractions. The city council recently spent a significant amount of money on
advertising and promoting visits to area attractions. They are interested in knowing
whether the advertising campaign was effective’”whether it increased the proportion of
tourists visiting local attractions. The proper set of hypotheses is ________________.
A. H0: p > 0.45 H1: p ≤ 0.45
B. H0: p < 0.45 H1: p ≥ 0.45
C. H0: p ≥ 0.45 H1: p < 0.45
D. H0: p ≤ 0.45 H1: p > 0.45
In multiple regression analysis, residual analysis is used to test the requirement that
___________.
A. The variation in the residuals is the same for all predicted values of Y
B. The independent variables are the direct cause of the dependent variable
C. The number of independent variables included in the analysis is correct
D. The prediction error is minimized
A survey of property owners’ opinions about a street-widening project was taken to
determine if owners’ opinions were related to the distance between their home and the
street. A randomly selected sample of 100 property owners was contacted and the
results are shown next.
What is the expected frequency for people against the project and who have over 120
feet of property foot-frontage?
A. 1.1
B. 3.9
C. 5.0
D. 5.5
A type of probability distribution that shows the probability of x successes in n trials,
where the probability of success remains the same from trial to trial, is referred to as a
___________.
A. hypergeometric probability distribution
B. uniform probability distribution
C. normal probability distribution
D. binomial probability distribution
Judging from recent experience, 5% of the computer keyboards produced by an
automatic, high-speed machine are defective. If six keyboards are randomly selected,
what is the probability that none of the keyboards are defective?
A. 0.001
B. 0.167
C. 0.735
D. 0.500
A chart used to show the results of a Pareto analysis is a:
A. range chart.
B. bar chart.
C. control chart.
D. fishbone diagram.
A population consists of 14 values. How many samples of size five are possible?
In an ANOVA for a multiple regression analysis, the three sources of variation are
__________________.
In 2000, an executive earned $100,000. In 2009, the executive earned $125,000. The
CPI in 2000 was 172.2, and the CPI in 2009 was 214.537. Using the CPI base,
1982-1984 = 100, what was the real income in 2000?
If the slope of a regression line is zero, the orientation of the regression line is
_________, which indicates a lack of a relationship.
The following stem-and-leaf display reports the number of boats shipped per week by
Ottertail Boats, Inc.
11| 1 5 9
12| 0 1 2 2 6 9
13| 0 1 2 3 4 5 5 7 8 8 9
14| 2 6 8
15| 0 1 2 4 5 7 8 9
16| 1 5 7 9
How often did the company ship more than 140 boats in a week?