For multiple choice questions, circle
only one answer, unless otherwise directed.
Show work for partial credit. If
R is required, insert the annotated code with the solution after the question
for full credit. (Putting all R code at the end of the document will not get
full credit)
Section 1: R is not required for this section, but it may
be used for calculations and to show work.
i.
502
senior human resource executives in MidAtlantic Region
ii.
Senior
human resources executives in the MidAtlantic Region
iii.
The
methods for finding the best candidates
iv.
Fiftyeight
percent responding that referrals were one of the methods used
i.
502
senior human resource executives in MidAtlantic Region
ii.
Senior
human resources executives in the MidAtlantic Region
iii.
The
methods for finding the best candidates
iv.
Fiftyeight
percent responding that referrals were one of the methods used
a. Variable (1) is:
i.
Quantitative,
discrete
ii.
Quantitative,
continuous
iii.
Qualitative,
nominal
iv.
Qualitative,
ordinal
b. Variable (2) is:
i.
Quantitative,
discrete
ii.
Quantitative,
continuous
iii.
Qualitative,
nominal
iv.
Qualitative,
ordinal
c. Variable (3) is:
i.
Quantitative,
discrete
ii.
Quantitative,
continuous
iii.
Qualitative,
nominal
iv.
Qualitative,
ordinal
d. Variable (4) is:
i.
Quantitative,
discrete
ii.
Quantitative,
continuous
iii.
Qualitative,
nominal
iv.
Qualitative,
ordinal
3. A researcher at a university in the
U.S. collected estimates from 153 different studies about calorie consumption. He conducted a metaanalysis using the
estimates gathered from the studies.
What type of study is this?
e. Observational Study
f.
Designed
Experiment
g. Secondary Source
4. A study was conducted to determine
the efficacy of a new tutoring method, method A. Half of the participants were given tutoring
method A, and the other half of the participants were given the standard
tutoring method. What type of study is
this?
h. Observational Study
i.
Designed
Experiment
j.
Secondary
Source
5. A study of the spending habits of
Americans was conducted. Participants
were selected and mailed a survey to complete and return to the researchers of
the study. What type of study is this?
k. Observational Study
l.
Designed
Experiment
m. Secondary Source
6. You are interested in finding the
probability of at least 5 people showing up at a queue in an hour. An average rate of people showing up at the
queue is provided. To find this
probability, you should use:
a. Binomial Distribution
b. Poisson Distribution
c. Bernoulli Distribution
d. Normal Distribution
7. You are interested in the probability
of observing at least 8 heads when flipping a standard coin 10 times. To find this probability, you should use:
a. Binomial Distribution
b. Poisson Distribution
c. Bernoulli Distribution
d. Normal Distribution
8. Match the letter of the term below
with the correct definition.
a. Predictive Value Positive
b. Predictive Value Negative
c. False Negative
d. False Positive
e. Sensitivity
f.
Specificity
g. Prevalence
_____________The rate at
which a disease/characteristic is present in the population.
_____________The
probability of a negative test result given that the disease is not present.
_____________The
probability of a positive test result given that the disease is present.
_____________A test
result indicating a positive status when the disease is not present.
_____________A test
result indicating a negative status when the disease is present.
_____________The
probability of a disease being present given that the test result was positive.
____________The
probability of a disease not being present
given that the test result was negative.
9. A study of 5000 adults with known
status for a type of cancer were screened using a newly developed cancer
screening test. A positive result
indicates that the test determined that the person has this type of
cancer. Use the contingency table to answer
the questions on the next page.

Cancer Status 

Test Result 
Cancer 
No Cancer 
Positive 
852 
348 
Negative 
23 
3777 
a. If a random participant in this study
is selected, what is the probability that he or she tests negative for Cancer?
i. 0.23
ii. 0.49
iv. 0.76
iii.
0.52
b. If a random participant in this study is
selected, what is the probability that her or she tests negative and does NOT
have cancer?
i.
0.7554
ii.
0.237
iii.
0.9659
iv.
0.3982
c. Estimate the sensitivity of the test.
i.
0.170
ii. 0.710
iii. 0.084
iv. 0.974
d. Estimate the specificity of the test.
i. 0.916
ii. 0.710
iii. 0.084
iv. 0.974
10. The prevalence of a disease is known
to be 0.2. The sensitivity of a test for
the disease is 0.85; the specificity is 0.98.
a. Calculate the predictive value positive.
i.
0.963
ii.
0.751
iii.
0.914
iv.
0.869
b. Calculate the
predictive value negative.
i. 0.963
ii. 0.751
iii. 0.914
iv. 0.869
Section 2: For this section, use the dataset called iris (available in base R – you do not
need to install anything else). You must use R to find the answers in this
section. Remember to insert code and any
plots you are required to produce.
1. Find the mean of the variable Petal.Length