1.
Two normal distributions are compared. One has a mean of 10 and a standard deviation of 10.
The second normal distribution has a mean of 10 and a standard deviation of 2. Which of the
following is true?
A) The locations of the distributions are different.
B) The distributions are from two different families of distributions.
C) The dispersions of the distributions are different.
D) The dispersions of the distributions are the same.
2.
When testing for differences between treatment means, a confidence interval is computed with
__________________.
A) The mean square error
B) The standard deviation
C) The sum of squared errors
D) The standard error of the mean
3.
Which symbol represents a test statistic used to test a hypothesis about a population mean?
A) α
B) β
C) μ
D) z
4.
If all the plots on a scatter diagram lie on a straight line, what is the standard error of estimate?
A) -1
B) +1
C) 0
D) Infinity
5.
Twenty randomly selected statistics students were given 15 multiple-choice questions and 15
open-ended questions, all on the same material. The professor was interested in determining if
students scored higher on the multiple-choice questions. This experiment is an example of
________________.
A) A one-sample test of means
B) A two-sample test of means
C) A paired t-test
D) A test of proportions
6.
An ANOVA has three sources of variation. They are _____, _____, and _____.
7.
The Intelligence Quotient (IQ) test scores for adults are normally distributed with a mean of 100
and a standard deviation of 15. What is the probability we could select a sample of 50 adults and
find the mean of this sample is less than 95?
A) 0.0091
B) 0.9818
C) 0.4909
D) 0.9544
8.
What distribution does the F distribution approach as the sample size increases?
A) Binomial
B) Normal
C) Poisson
D) Exponential
9.
A national manufacturer of unattached garages discovered that the distribution of the time for
two construction workers to erect the Red Barn model is normally distributed with a mean of 32
hours and a standard deviation of 2 hours. What percent of the garages take between 32 and 34
hours to erect?
A) 16.29%
B) 76.71%
C) 3.14%
D) 34.13%
10.
The F distribution is a ______________ distribution.
11.
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?
