STA Final Exam Questions And Answers.
Verified and Updated.
On June 2, 2007, a nurse in Wales accidentally injected an 85-year-old patient with a lethal
amount of insulin during a home visit. The syringes used to inject insulin are typically marked
with insulin units instead of the usual milliliters. Finding herself without an insulin syringe on
hand, the nurse retrieved a new syringe from her car. She did not notice, however, that the
syringe she grabbed was marked in milliliters instead of insulin units. If 1 milliliter equals 100
insulin units, how many milliliters should the patient have been given if she had been prescribed
36 units? - answer✔✔1 milliliter = 100 units so 0.01 milliliter = 1 unit. It follows that 0.36
milliliters = 36 units. So she should have injected the patient with 0.36 milliliters.
Which of the following statements is true? - answer✔✔The mean and standard deviation are
sensitive to outliers
A researcher did experiments with six sets of animals with each set having five animals each. In
a paper accepted into the Journal of Experimental Medicine the researcher reported the
percentage of each set of five that had successful outcomes. Here are the numbers this guy
reported: 53, 58, 63, 46, 48, and 57. What is wrong with these numbers? - answer✔✔they can't
be results on sets of five animals unless they are multiples of 20 percent
Which of the following statements do you think could possibly be true? - answer✔✔The number
of students enrolled at Midville University decreased by 10.4% last year.
The well-respected journal Science, in an article on insects and plants, mentioned a California
field that produced 750,000 melons per acre. How do you react to that? It may help you know
that an acre is 43,560 square feet. - answer✔✔This is unreasonable, suggesting about 17 melons
per square foot
The claim has been made that over 4 million women in the U.S. are battered to death each year
by a spouse or boyfriend. What is wrong with this claim? - answer✔✔Only about 2.4 million
people die in the U.S. each year from all causes.
The following graph is from the Florida Department of Law Enforcement. It has been used to
argue that murder decreased in Florida once a 2005 "Stand Your Ground" law was enacted. Does
the graph actually support that statement? - answer✔✔No. The y-axis is inverted so the dip after
2005 is actually a spike.
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,What do we mean by "human inference?" - answer✔✔Off-hand phrase taken to mean inference
we make from statistical constructs
If the standard deviation of a set of data is computed to be 4, then the variance is: - answer✔✔2
In a study reported in the Chicago tribune, in 2012, twenty-four students were fatally shot during
the school year that ended June 15, four fewer than in the 2010-11 year. But the overall shooting
toll —319—was the highest in four years and a nearly 22 percent increase from 2011. What was
the total number of shootings in 2011? - answer✔✔261
What can one say about the sampling distribution of a sample statistic based on a simple random
sample? - answer✔✔it is about bell-shaped and peaks above the parameter
You ask a question to a random sample of 1000 adults in California (population 38.3 million
people) and to a separate random sample of 1000 adults in Indiana (population 6.6 million
people). You make separate 95% confidence statements about the percent of all adults in each
state who agree. Your margin of error for Indiana is:
(you may find the following generic confidence interval information useful) - answer✔✔the
same as in California, because the two samples are the same size.
The distribution shown here represents the sampling distribution that resulted from 44 simple
random samples, each of size 50, taken from a manufactured population of 250 people. In each
case the proportion of sampled individuals who agreed that Facebook was doing an adequate job
protecting users' data was recorded. About what percentage of the time did a sample percentage
between 21% and 36% occur? - answer✔✔80%
Which of the following is a strategy for reducing non-sampling errors? - answer✔✔Use of
incentives for non-responders
In September of 2016, an article in The Denver Post declared "Colorado in Dead Heat Between
Hillary Clinton and Donald Trump." The article went on to say: "The survey by CNN and ORC
International found 42 percent of likely Colorado voters backed Trump compared to the 41
percent who supported Clinton; a statistical tie given the margin of error of 3.5 percentage
points." The article did not report the sample size. However, if this margin of error is a 95%
margin of error, what would the sample size have to be, more or less?
(You might find the following generic confidence interval information useful:) -
answer✔✔About 816
A survey was conducted by Playboy, asking questions about the sex lives of 5,000 U.S.
University and College students. One question asked: "Are you in a nude picture on someone's
camera phone?" 34 percent said "yes". Other samples of size 5,000, if asked the same question,
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, would likely not produce a sample percentage of 34%. What is this variability called? -
answer✔✔Sampling variability
A survey was conducted by Playboy, asking questions about the sex lives of 5,000 U.S.
University and College students. One question asked: "Are you in a nude picture on someone's
camera phone?" 34 percent said "yes". Name at least one error you'd expect this survey to suffer
from even if all 15.9 million College and University students in the U.S. had answered, and not
just 5,000. - answer✔✔Error caused by fabricated responses
Recall the article about the Harris Poll that was discussed in one of our BN assignments. Harris
is a major polling organization that refuses to accompany their poll reports with a margin of
error. What is one reason that was given for such a bold omission? - answer✔✔Harris recognizes
that there are many sources of error that are not addressed by the MOE, so reporting it might be
misleading.
A Dean of Admissions at U.K. once tallied up the ACT scores for ALL entering freshman for
that year and reported that the average was 25. He then attached a margin of error at the urging
of a faculty member in the audience. That faculty member was: - answer✔✔confused, because
the Dean's figure was not subject to any sampling variability
A Ph.D. candidate in the College of Education once defended her misleading and confusing
questionnaire by arguing that her margin of error was low, only about 3%. This argument is: -
answer✔✔confused, because the margin of error has nothing to do with poor questionnaire
designs
Please read the following article from CBS News. What is the sample for the CBS News Poll?
Title: Poll: Majority of Americans Back Stricter Gun Laws
Authors: Sarah Dutton, Jennifer De Pinto, Anthony Salvanto, Fred Backus and Leigh Ann
Caldwell
Source: CBS News January 17, 2013
As the president outlined sweeping new proposals aimed to reduce gun violence, a new CBS
News/ New York Times poll found that Americans back the central components of the
president's proposals, including background checks, a national gun sale database, limits on high
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