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A researcher is studying the relationship between 10 different variables and a critical
measure of business performance. What method can be used to select the best set of
variables to predict performance?
A. Stepwise regression
B. ANOVA
C. Simple linear regression
D. Residual analysis
An index number is a percent that measures the change from one period of time to
another in terms of _________.
A. value
B. price
C. quantity
D. all of these
Tables of normal distribution probabilities are found in many statistics books. These
probabilities are calculated from a normal distribution with ___________.
A. A mean of 1 and a standard deviation of 1
B. A mean of 100 and a standard deviation of 15
C. A mean of 0 and a standard deviation of 15
D. A mean of 0 and a standard deviation of 1
For a given population with a normal probability distribution, the sampling distribution
of is a normal probability distribution for:
A. small sample sizes only.
B. any sample size.
C. large sample sizes only.
D. sample sizes greater than 30 only.
The claim that "40% of those persons who retired from an industrial job before the age
of 60 would return to work if a suitable job was available" is to be investigated at the
0.02 significance level. If 74 out of the 200 workers sampled said they would return to
work, what is our decision?
A. Do not reject the null hypothesis because -0.879 lies in the region between +2.326
and -2.326.
B. Do not reject the null hypothesis because -0.879 lies in the region between +2.576
and -2.576.
C. Reject the null hypothesis because 37% is less than 40%.
D. Do not reject the null hypothesis because 37% lies in the area between 0% and 40%.
A regression analysis yields the following information:
; n = 10; sy∙x = 1.66; ΣX = 32; ΣX2 = 134;
Compute the 95% prediction interval when X = 4.
A. 0.0, 4.05
B. 2.67, 5.33
C. 4.118, 12.226
D. 6.873, 9.527
Which of the following is a requirement for use of the hypergeometric distribution?
A. Only two possible outcomes
B. Trials are independent
C. Probability of a success is greater than 1.0
D. Sampling with replacement
Each salesperson in a large department store chain is rated on their sales ability and
their potential for advancement. The data for the 500 sampled salespeople are
summarized in the following table.
What is the probability that a salesperson selected at random has above average sales
ability and has excellent potential for advancement?
A. 0.20
B. 0.50
C. 0.27
D. 0.75
In order to convert class frequency to relative class frequency, we
A. divide the midpoint of the class by the sample size.
B. divide the frequency of the class by the midpoint.
C. divide the sample size by the frequency of the class.
D. divide the frequency of the class by the sample size.
When TV advertisements report "2 out of 3 dentists surveyed indicated they would
recommend Brand X toothpaste to their patients," an informed consumer may question
the conclusion because the:
A. Sample was only 5 dentists.
B. Sample of dentists is clearly explained.
C. Advertisement does not include the total number of dentists surveyed.
Refer to the following breakdown of responses to a survey of "Are you concerned about
being tracked while connected to the Internet?"
What percent of the responses indicated that users were somewhat concerned?
A. 40%
B. 70%
C. 20%
D. 100%
The Quality Assurance Department selected 12 samples of 100 printed circuit boards
and tested them. The number of defective printed circuit boards in each sample was 3,
3, 0, 5, 1, 1, 5, 6, 6, 2, 0, and 1. The measurement of quality is based on:
A. an attribute
B. a variable
C. a scale
D. a chart
A frequency distribution has a mean of 200 and a standard deviation of 20. The class
limits for one class are 220 up to 240. What are the standard normal z-statistics for the
class limits?
A. -20 and 20
B. -2.0 and -1.0
C. 200 and 220
D. 1.0 and 2.0
Unorganized data is referred to as ________ data.
The probability of two or more events occurring concurrently is called a(n) _________.
A. Conditional probability
B. Empirical probability
C. Joint probability
D. Tree diagram
Data for selected vegetables purchased at wholesale prices for 1995 and 2007 are
shown next.
What is the simple price relative for peas?
Suppose your annual 2001 salary was $40,000 and your 2006 salary was $52,000.
Assume the annual CPI rose from 177.1 to 202.9 during this period of time. In which
year was your "real" income larger?
For any goodness-of-fit test, the null hypothesis is that there is ____ difference between
the expected and observed distributions.
The following data was collected on mutual fund prices.
Compute value index to compare mutual fund prices in 2010 to 2000.
The branch of statistics that uses sample information to make conclusions about a
population is called _________________ statistics.
