Graphs
Experiments
and Studies
Sampling and
Surveys
Center
and
Spread
Normal
Distributions
100
100
100
100
100
200
200
200
200
200
300
300
300
300
300
400
400
400
400
400
500
500
500
500
500
Graphs – 100
The median percent of
obese adults in these
45 states is:
(a) 17.69%
(b) 17.8%
(c) 17.85%
(d) 17.9%
(e) 23%
Graphs - 200
Which point on this boxplot is
the first quartile of the
distribution?
Graphs - 300
We see from the plot
that the median number
of calories in a beef hot
dog is about
(a)190
(b)179
(c)153
(d)139
(e)129
Graphs - 400
The mean is
a) less than the median because the
distribution is skewed left
b) greater than the median because the
distribution is skewed left
c) less than the median because the
distribution is skewed right
d) equal to the median
e) impossible to determine
Graphs - 500
Which of the following best describes the
given stemplot?
A. Skewed right, use the mean and standard
deviation to describe the data
B. Skewed right, use the 5 number summary
to describe the data
C. Skewed left, use the mean and standard
deviation to describe the data
D. Skewed left, use the 5 number summary
to describe the data
E. Symmetric, use either summary to
describe the data
Experiments and Studies - 100
In a study subjects were randomly assigned to wear a new
bug repellant or no repellant. The number of bug bites were
recorded for each subject. This is an example of
A. A Sample Survey
B. An Observational Study
C. An Experiment
D. A Simple Random Sample
E. A Stratified Sample
Experiments and Studies - 200
Which of the following is not a principal of experimental
design?
A. Control
B. Randomization
C. Replication
D. Blocking
E. Using many subjects to reduce chance variation
Experiments and Studies - 300
Researchers interested in the effects of a new drug to help people quit
smoking wonder whether or not a person is depressed would affect the
outcome. They enlist 300 subjects without depression and 140 subjects
with depression. Within each group they randomly assign each person
the new drug or a placebo. They then record whether the person was
able to quit smoking successfully. Breaking the subjects into two groups
first is an example of:
A.
B.
C.
D.
E.
Randomization
Stratifying
Blocking
Replication
Systematic Sampling
Experiments and Studies - 400
The difference between an experiment and an
observational study is
A. Observational studies don't have explanatory and
response variables.
B. Experiments don't have placebos.
C. An experiment imposes treatments on subjects, while
an observational study measures variables of interest
without attempting to influence responses.
D. Experiments are double-blind, while observational
studies are only single-blind.
E. All of the above.
Experiments and Studies - 500
A magazine article on preventing cancer says, "Eating one
serving of tofu a week may cut your risk of breast cancer 15
percent, recent research suggests." If the data comes from an
observational study, then
A. the results must be false.
B. the results must be true.
C. there may be lurking variables.
D. perhaps those who choose to eat more tofu are, for some
reason, less susceptible to breast cancer than those who
didn't.
E. Both (c) and (d) are true.
Sampling and Surveys – 100
In a recent poll, adults were asked how many cell phones
they had owned in their lifetime. The variable being
measured is
A. the number of adults polled
B. the number of adults with cell phones
C. the number of cell phones a person has owned
D. The number of cell phones a person owns right now
E. the age of the person surveyed
Sampling and Surveys - 200
A quality control inspector wants to check the quality of the
coffee beans being produced. He goes to each of 10 batches
of beans that had been roasted that day and takes a random
cupful of coffee beans to be used for testing. This is an
example of which kind of sampling method?
A. Simple Random Sampling
B. Systematic Random Sampling
C. Voluntary Response
D. Stratified Random Sampling
E. Blocking
Sampling and Surveys - 300
An environmental watchdog group posted on their website a
survey question asking readers to answer the following question,
"Given the recent oil spill in the Gulf of Mexico and the
subsequent environmental disaster, should we continue to allow
oil companies to plunder and destroy the ocean depths for oil?"
The results of this survey may not be accurate because of
A.
B.
C.
D.
E.
Nonsampling error
Undercoverage
Wording of the Question
Voluntary Response Bias
All the above
Sampling and Surveys - 400
When we take a census, we collect data from
A. a stratified random sample
B. every individual selected in a simple random
sample
C. every individual in the population
D. a voluntary response sample
E. a convenience sample
Sampling and Surveys - 500
A political polling group took a simple random sample of a 250
residents of a large city asking if they would be voting for the
Republican or Democratic candidate in the upcoming election for
mayor. They found that 130 would be voting for the Democrat. The
group reported that 52% of the voters would be voting for the
Democratic candidate for mayor. The actual result was that 58% voted
for the Democratic candidate. Which of the following is correct?
A.
B.
C.
D.
E.
The 52% and 58% are both parameters
The 52% and 58% are both statistics
The 52% is a parameter; the 58% is a statistic
The 52% is a statistic; the 58% is a parameter
It is impossible to tell which is a parameter or statistic
Center and Spread - 100
The 11 states in the Midwest have these percents of obese adults:
19.5 19.5 17.9 20.7 17.9 15.7
19.3 19.8 18.7 15.4 17.5
The mean and standard deviation of these values are about:
A.
B.
C.
D.
E.
18.35 and 1.60
18.35 and 201.9
18.35 and 3733.93
18.35 and 1.68
18.35 and 11
Center and Spread - 200
Fifty percent of the observations will be at or
above the
A.
B.
C.
D.
E.
maximum
standard deviation
mean
median
first quartile
Center and Spread - 300
189 284 296 312 325 368 369 369 389 625
Using the 1.5IQR Rule, identify any outliers.
A.
B.
C.
D.
E.
189
189 and 625
625
There are no outliers
We can’t use the 1.5IQR rule because the data set is
small.
Center and Spread - 400
If a set of observations has a standard deviation
that is zero, which of the following must be true?
A.The mean is also zero.
B.All the values are exactly the same.
C.There is no relationship between the
observations.
D.The standard deviation can never be zero.
E.The data is skewed.
Center and Spread - 500
A set of observations has a mean of 145 and a standard
deviation of 32. If each observation has 15 added to it's value
what would happen to the mean and standard deviation?
A. They would both stay the same.
B. Both statistics would increase by 15.
C. Only the mean would increase by 15; the standard
deviation would stay the same.
D. Only the standard deviation would increase by 15; the
mean would stay the same.
E. It is impossible to figure out without having the actual data.
Normal Distributions - 100
What is the standard score for an observational
value of 49 from a distribution with mean 32 and
standard deviation of 12?
A.
B.
C.
D.
46.333
1.417
1.417
46.333
Normal Distributions - 200
The weights of male Doberman Pinschers is normally
distributed with a mean of 77 lbs. and a standard
deviation of 4.3 lbs. What proportion of male
Doberman Pinschers weigh less than 65 lbs.?
A.0.0026
B.0.9974
C.0.4974
D.0.0508
Normal Distributions - 300
The weights of male Doberman Pinschers is normally
distributed with a mean of 77 lbs. and a standard
deviation of 4.3 lbs. What proportion of male
Doberman Pinschers are between 68 and 79 lbs.?
A.
B.
C.
D.
0.6609
0.4818
0.3305
0.2567
Normal Distributions - 400
The weights of male Doberman Pinschers is
normally distributed with a mean of 77 lbs. and a
standard deviation of 4.3 lbs. What would be the
lowest weight of the top 10% of Doberman
Pinschers?
A. 80 lbs
B. 85.6 lbs
C. 82.5 lbs
D. 90 lbs
Normal Distributions - 500
The weights of male Doberman Pinschers is
normally distributed with a mean of 77 lbs. and a
standard deviation of 4.3 lbs. Find the IQR of
weights.
A. 5.8 lbs.
B. 6.0 lbs.
C. 74.1 lbs
D. 79.9 lbs