1 Exampromax - Stuvia US
STA 210 Exam 1 (Quiz Review) Questions and
Answers 100% Correct Answers Already
Graded A+
Q: Which of the following statements do you think could possibly be true?
Ans: The number of students enrolled at Midville University decreased by 10.4%
last year.
Q: The well-respected journal Science, in an article on insects and plants,
mentioned a California field that produced 750,000 melons per acre. How
Exampromax - Stuvia US
do you react to that? It may help you know that an acre is 43,560 square
feet.
Ans: This is unreasonable, suggesting about 17 melons per square foot.
Q: In the New York Times Magazine, Tara Parker-Pope makes the case
that teenagers are more conservative than their parents were. For example,
the fraction of high-school seniors who reported that they had recently
consumed alcohol fell from 72% in 1980 (illustrated as the big one-gallon -
128 ounce - jug) to 40% in 2011 (illustrated as the little 8-ounce glass). The
actual percent "Parents" consumption divided by percent "Kids"
consumption is approximately _____ but the graphic makes that ratio look
more like _____. The two best answers for filling in these blanks (in
respective order) are:
(chart)
Ans: 1.8 and 16
Q: 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?
Ans: Only about 2.4 million people die in the U.S. each year from all causes.
Q: What do we mean by "human inference?"
, 2 Exampromax - Stuvia US
Ans: Off-hand phrase taken to mean inference we make from statistical
constructs.
Q: Are you numerate? Here's a question from the workbook that will help
you decide. An article entitled "Cocaine Floods the Playground: Use of the
Addictive Drug by Children Doubles in a Year" appeared in 2006 in The
Times. Here is an excerpt of what the authors said "Cocaine use among
children has doubled in a year as the fashionable drug of the middle classes
extends its reach from the dinner party to the playground. Hundreds of
thousands of 11 to 15-year-olds are being offered the Class A drug ....
Figures published yesterday showed that cocaine use among 11 to 15-year-
olds doubled from 1 percent to 2 percent between 2004 and 2005." Here is
the table the authors refer to:
(chart)
Exampromax - Stuvia US
Ans: 1.9 is about 2 and 1.4 is about 1 so that is likely the source for the word
"doubles."
Q: Refer to Question 1. What is the likely "human inference" and what is
the "statistical construct" that is being used to produce it?
Ans: Human inference is that cocaine use is out of control and the statistical
construct is the ratio 2-to-1.
Q: In the piece on Deathly Hallow's book sales, it was claimed that more
than 50,000 were sold per minute on the average. What was wrong with this
figure?
Ans: 300,000 were sold on average each hour. That means only 5000 were sold
per minute. Decimal error.
Q: Recently the Central Kentucky Youth Orchestras started posting
rehearsal participation as percentages. So if there are 10 trumpets in an
orchestra and 9 showed up to rehearsal, then they'd report a 90%
participation rate for trumpets. For sake of simplicity, suppose unbeknownst
to the public there are 4 flutes and 10 trumpets. Suppose one flute misses
rehearsal and one trumpet misses rehearsal. Would reporting participation
results as percentages for each group be potentially misleading? Why or why
not?
STA 210 Exam 1 (Quiz Review) Questions and
Answers 100% Correct Answers Already
Graded A+
Q: Which of the following statements do you think could possibly be true?
Ans: The number of students enrolled at Midville University decreased by 10.4%
last year.
Q: The well-respected journal Science, in an article on insects and plants,
mentioned a California field that produced 750,000 melons per acre. How
Exampromax - Stuvia US
do you react to that? It may help you know that an acre is 43,560 square
feet.
Ans: This is unreasonable, suggesting about 17 melons per square foot.
Q: In the New York Times Magazine, Tara Parker-Pope makes the case
that teenagers are more conservative than their parents were. For example,
the fraction of high-school seniors who reported that they had recently
consumed alcohol fell from 72% in 1980 (illustrated as the big one-gallon -
128 ounce - jug) to 40% in 2011 (illustrated as the little 8-ounce glass). The
actual percent "Parents" consumption divided by percent "Kids"
consumption is approximately _____ but the graphic makes that ratio look
more like _____. The two best answers for filling in these blanks (in
respective order) are:
(chart)
Ans: 1.8 and 16
Q: 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?
Ans: Only about 2.4 million people die in the U.S. each year from all causes.
Q: What do we mean by "human inference?"
, 2 Exampromax - Stuvia US
Ans: Off-hand phrase taken to mean inference we make from statistical
constructs.
Q: Are you numerate? Here's a question from the workbook that will help
you decide. An article entitled "Cocaine Floods the Playground: Use of the
Addictive Drug by Children Doubles in a Year" appeared in 2006 in The
Times. Here is an excerpt of what the authors said "Cocaine use among
children has doubled in a year as the fashionable drug of the middle classes
extends its reach from the dinner party to the playground. Hundreds of
thousands of 11 to 15-year-olds are being offered the Class A drug ....
Figures published yesterday showed that cocaine use among 11 to 15-year-
olds doubled from 1 percent to 2 percent between 2004 and 2005." Here is
the table the authors refer to:
(chart)
Exampromax - Stuvia US
Ans: 1.9 is about 2 and 1.4 is about 1 so that is likely the source for the word
"doubles."
Q: Refer to Question 1. What is the likely "human inference" and what is
the "statistical construct" that is being used to produce it?
Ans: Human inference is that cocaine use is out of control and the statistical
construct is the ratio 2-to-1.
Q: In the piece on Deathly Hallow's book sales, it was claimed that more
than 50,000 were sold per minute on the average. What was wrong with this
figure?
Ans: 300,000 were sold on average each hour. That means only 5000 were sold
per minute. Decimal error.
Q: Recently the Central Kentucky Youth Orchestras started posting
rehearsal participation as percentages. So if there are 10 trumpets in an
orchestra and 9 showed up to rehearsal, then they'd report a 90%
participation rate for trumpets. For sake of simplicity, suppose unbeknownst
to the public there are 4 flutes and 10 trumpets. Suppose one flute misses
rehearsal and one trumpet misses rehearsal. Would reporting participation
results as percentages for each group be potentially misleading? Why or why
not?
