Statistics and Data Analysis Final Exam Review – Part 1
Transcript
Slide 1
Slide 2
Slide 3
100 200 300 400 500 Graphs Experiments and Studies Sampling and
Surveys Center and Spread Normal Distributions
Slide 4
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% [insert
answer] Answer: B
Slide 5
Graphs - 200 Which point on this boxplot is the first quartile
of the distribution? Answer: B
Slide 6
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 Answer: C
Slide 7
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 Answer: A
Slide 8
Graphs - 500 Answer: B 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
Slide 9
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 Answer: C
Slide 10
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 Answer: D
Slide 11
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.Randomization B.Stratifying C.Blocking
D.Replication E.Systematic Sampling Answer: C
Slide 12
Experiments and Studies - 400 Answer: C 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.
Slide 13
Experiments and Studies - 500 Answer: E 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.
Slide 14
Sampling and Surveys 100 Answer: C 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
Slide 15
Sampling and Surveys - 200 Answer: D 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
Slide 16
Sampling and Surveys - 300 Answer: E 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.Nonsampling error B.Undercoverage C.Wording of the
Question D.Voluntary Response Bias E.All the above
Slide 17
Sampling and Surveys - 400 Answer: C 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
Slide 18
Sampling and Surveys - 500 Answer: D 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.The 52% and 58% are both
parameters B.The 52% and 58% are both statistics C.The 52% is a
parameter; the 58% is a statistic D.The 52% is a statistic; the 58%
is a parameter E.It is impossible to tell which is a parameter or
statistic
Slide 19
Center and Spread - 100 Answer: D 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.18.35 and 1.60 B.18.35 and 201.9 C.18.35 and
3733.93 D.18.35 and 1.68 E.18.35 and 11
Slide 20
Center and Spread - 200 Answer: D Fifty percent of the
observations will be at or above the A.maximum B.standard deviation
C.mean D.median E.first quartile
Slide 21
Center and Spread - 300 Answer: C 189284296312325368369 389625
Using the 1.5 IQR Rule, identify any outliers. A.189 B.189 and 625
C.625 D.There are no outliers E.We cant use the 1.5 IQR rule
because the data set is small.
Slide 22
Center and Spread - 400 Answer: B 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.
Slide 23
Center and Spread - 500 Answer: C 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. Daily Double!
Slide 24
Normal Distributions - 100 Answer: C What is the standard score
for an observational value of 49 from a distribution with mean 32
and standard deviation of 12? A. 46.333 B. 1.417 C. 1.417 D.
46.333
Slide 25
Normal Distributions - 200 Answer: A 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
Slide 26
Normal Distributions - 300 Answer: A 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.0.6609 B.0.4818
C.0.3305 D.0.2567
Slide 27
Normal Distributions - 400 Answer: C 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
Slide 28
Normal Distributions - 500 Answer: A 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