A marketing research agency was hired to test a new DVD player. Consumers rated it
outstanding, very good, fair, or poor. The level of measurement for this experiment is
ordinal.
For any distribution, there are an equal number of values above and below the mean.
If the null hypothesis is
If the null hypothesis that two means are equal is TRUE, where will 97% of the
computed z values lie between?
A. 2.58
B. 2.33
C. 2.17
D. 2.07
One component of a time series is cyclical variation. An example of cyclical variation is
the business cycle that consists of periods of prosperity followed by periods of
recession, depression, and recovery.
The p-value is determined by the value of a ______________________.
The Wilcoxon signed-rank test can replace the paired t test when the assumptions for t
cannot be met.
Which of the following is TRUE about the standard error of estimate?
A. It is a measure of the accuracy of the prediction.
B. It is based on squared vertical deviations between Y and X.
C. It can be negative.
D. It is calculated using the regression mean square.
The standard error of the mean measures the dispersion of the sampling distribution of
the sample mean.
An illustration of an experiment is turning the ignition key of an automobile as it comes
off the assembly line to determine whether or not the engine will start.
The mode is the value of the observation that appears most frequently.
A dot plot is useful for showing individual observations.
For a goodness-of-fit test, the following are possible null and alternate hypotheses:
H0: Sales are uniformly distributed among the five locations.
H1: Sales are not uniformly distributed among the five locations.
A local politician wants an estimate of the proportion of the population who support her
fiscal policies. She wants the estimate to be within .06 of the
Which of the following is
Which probability distribution is used to develop a control chart for sample means?
A. Normal distribution
B. Chi-square distribution
C. Poisson distribution
D. Binomial distribution
The relative frequency for a class represents the ________________.
A. Class width
B. Class midpoint
C. Class interval
D. Percent of observations in the class
The trend forecast equation is Ŷ = 50 + 420t. The next forecast is for period 10. The
typical seasonal index for period 10 is 0.82. What are the forecast sales for period 10?
A. 4,200
B. 4,250
C. 4,000
D. 3,485
Data for selected vegetables purchased at wholesale prices for 1995 and 2007 are
shown next.
What is the value index?
A. 110.3
B. 115.6
C. 108.0
D. 118.5
Samples of 200 parts were taken every day and the number of defectives was counted.
What are the upper and lower limits for the percent defective chart?
A. 0.02 and 0
B. 0.2970 and 0
C. 0.0297 and 0
D. 0.0497 and 0
A ______________ analysis predicts the future on the basis of past data.
A new machine is set or calibrated to fill tubes of toothpaste at precisely 6.75 ounces.
Then, once the machine is running, a sample of six tubes is taken every three hours and
weighed with the following results:
What is the mean range?
A. 0.000
B. 0.160
C. 0.080
D. 0.203
To test if an observed frequency distribution with five classes is normally distributed,
we need to find ___________________.
A. The t-statistic
B. The expected, normally distributed class frequencies
C. The class marks
D. The class relative frequencies
The mean weight of trucks traveling on a particular section of I-475 is not known. A
state highway inspector needs an estimate of the population mean. He selects and
weighs a random sample of 49 trucks and finds the mean weight is 15.8 tons. The
population standard deviation is 3.8 tons. What is the 95% confidence interval for the
population mean?
A. 14.7 and 16.9
B. 13.2 and 17.6
C. 10.0 and 20.0
D. 16.1 and 18.1
Recently, students in a marketing research class were interested in the driving behavior
of students. Specifically, the marketing students were interested in finding out if
exceeding the speed limit was related to social activity. They collected the following
responses from 100 randomly selected students:
Using 0.05 as the significance level, what is the critical value for the test statistic?
A. 9.488
B. 5.991
C. 7.815
D. 3.841
The names of the positions in a corporation, such as chief operating officer or
controller, are examples of what type of variable?
A. Qualitative
B. Quantitative
C. Interval
D. Ratio
A lamp manufacturer designed five lamp bases and four lampshades that could be used
together. How many different arrangements of base and shade can be offered?
A. 5
B. 10
C. 15
D. 20
A new machine is set or calibrated to fill tubes of toothpaste at precisely 6.75 ounces.
Then, once the machine is running, a sample of six tubes is taken every three hours and
weighed with the following results:
What is X-bar for 7 pm?
A. 6.71
B. 6.72
C. 6.74
D. 6.76
A random sample of 40 companies with assets over $10 million was surveyed and
asked to indicate their industry and annual computer technology expense. The ANOVA
comparing the average computer technology expense among three industries rejected
the null hypothesis. The mean square error (MSE) was 195. The following table
summarized the results:
Based on the comparison between the mean annual computer technology expense for
companies in the education and tax services industries, _________________.
A. a confidence interval shows that the mean annual computer technology expenses are
not significantly different
B. the ANOVA results show that the mean annual computer technology expenses are
significantly different
C. a confidence interval shows that the mean annual computer technology expenses are
significantly different
D. the ANOVA results show that the mean annual computer technology expenses are
not significantly different
Which of the following is not a measure of dispersion?
A. The interquartile range
B. The standard deviation
C. The 50th percentile
D. The range
Based on the regression equation, we can _______________.
A. Predict the value of the dependent variable given a value of the independent variable
B. Predict the value of the independent variable given a value of the dependent variable
C. Measure the association between two variables
D. Measure cause and effect
If time series data are plotted on graph paper having an arithmetic scale that increases
or decreases by equal percents, what type of graph will it be?
A. Straight line
B. Linear
C. Curvilinear
D. Logarithmic
The take home pay of an employee working in an urban area for 1993 and 2007 are:
If the CPI rose from 159 in 1993 to 210 in 2007 (1982-84 = 100), what was the “real”
take home pay of the employee in 2007?
A. $5,000
B. $15,000
C. $113,200
D. $53,904
The production of car tires in any given year is related to the number of cars produced
that year and in prior years. Suppose our econometric model resulted in the following
data.
What is the equation for our model?
If an ANOVA test is conducted and the null hypothesis is rejected, what does this
indicate?
A. The p-value is less than α.
B. The population means are equal.
C. At least one pair of population means is different.
D. All population means are different.
A random sample of 42 college graduates revealed that they worked an average of 5.5
years on the job before being promoted. The sample standard deviation was 1.1 years.
Using the 0.99 degree of confidence, what is the confidence interval for the population
mean?
A. 5.04 and 5.96
B. 5.06 and 5.94
C. 2.67 and 8.33
D. 4.40 and 6.60
A large restaurant contracts with a local laundry to wash white napkins. The laundry
returns the napkins in bundles of one-hundred napkins. The restaurant randomly
samples ten napkins from each bundle to make sure that the napkins are clean with no
stains or other defects. By sampling only ten of the napkins, the restaurant may
conclude that the all the napkins are clean and use the bundle, even when the napkins
are actually dirty and should not be used. This sampling risk is called:
A. producer’s risk.
B. uncertainty.
C. consumer’s risk.
D. inspection risk.
Using the following regression analysis:
What is the residual mean square?
A soap manufacturer is experimenting with several formulas of soap powder. Three of
the formulas were selected for further testing by a panel of homemakers. The ratings for
the three formulas are as follows:
What is the value of H?
Percentiles divide a frequency distribution into _________ equal parts.
Among the many classes held at your college or university, your statistics class has
been selected for a study. This one class is referred to as a ____________.
A useful method for smoothing a time series to examine a trend is called a ______.
