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The requirement that the probability of success remains constant from trial to trial is a
property of the _________________ distribution.
A. binomial
B. uniform
C. normal
D. Poisson
Using the p-value rule, if a null hypothesis is not rejected at a significance level of .05,
it will _____________ be rejected at a significance level of .01
A. always
B. sometimes
C. never
For a given data set, value of X, and confidence level, if all the other factors are
constant, the confidence interval for the mean value of Y will ___________ be wider
than the corresponding prediction interval for the individual value of Y.
A. always
B. sometimes
C. never
822 customers were randomly selected from those who had recently bought a book over
the Internet. The chart below shows the breakdown of the classification of the book
type.
What percentage of the books purchased were self-help books?
A. 11.44
B. .1144
C. 1.82
D. 0.0182
E. 0.940
A flaw possessed by a population or sample unit is ___________.
A. always random
B. a defect
C. displayed by a dot plot
D. the cause for extreme skewness to the right
The population of lengths of aluminum-coated steel sheets is normally distributed with
a mean of 30.05 inches and a standard deviation of 0.2 inches. What is the probability
that a randomly selected sample of 4 sheets will have an average length of less than
29.9 inches long?
A. .0668
B. .9332
C. .0014
D. .4404
Consider the following data.
Calculate S0 using simple exponential smoothing and α =.2.
Wax-com Electronics Inc. claims that a certain circuit board has a median operating life
of less than 20,000 hours. A random sample of 25 such circuit boards showed 8 circuit
boards failing before 20,000 hours and 17 circuit boards failing after 20,000 hours.
Assume the useful life of the circuit board is not normally distributed and state the null
hypothesis.
A. H0: Md ≥ 20,000
B. H0: Md ≤ 20,000
C. H0: Md < 20,000
D. H0: Md ≠ 20,000
The following table shows the Price-to-Earnings ratio for a stereo equipment
manufacturing company between 1998 and 2002.
Determine the percentage change in the P/E ratios from 1999 to 2000.
A. 23.97%
B. 31.53%
C. 27.26%
D. −31.53%
E. −23.97%
The __________ of event X consists of all sample space outcomes that do not
correspond to the occurrence of event X.
A. independence
B. complement
C. conditional probability
D. dependence
The sampling distribution of the sample mean is a normal distribution for ________
sample sizes, regardless of the shape of the corresponding population distribution.
A. random
B. large
C. larger than 50
D. small
When testing a hypothesis about a single mean, if the sample size is 51 and the
population standard deviation is known, the correct test statistic to use is ___________.
A. r
B. z
C. t
D. p-value
The effects of different levels of qualitative independent variables are described using
___________ variables.
A. dependent
B. response
C. dummy
D. quantitative
Daily temperature in a local community collected over a 30-day time period is an
example of cross-sectional data.
The Wilcoxon rank sum test is used to compare the locations of two _____________
populations.
A. dependent
B. normal
C. independent
D. similar
The simultaneous occurrence of events A and B is represented by the notation
_______________.
A. A υ B
B. A|B
C. A∩B
D. B|A
