Chapter 01 - 6e Answers Included ✅
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Determine whether the evaluated group is a population or a sample.
1) The average age of 45 employees of a large company is found to be 32 years. 1)
A) Sample B) Population
2) A researcher examines the records of all the registered voters in one city and finds that 43% are 2)
registered Democrats.
A) Sample B) Population
3) A researcher determines that of all 25 year old women in her city, 37% are married. 3)
A) Sample B) Population
4) A researcher determines that 42.7% of all downtown office buildings have ventilation problems. 4)
A) Population B) Sample
5) A professor is trying to determine whether performance on the first exam is related to course 5)
drop rate in one of her classes. After taking the first exam, 15 of the students dropped the class.
A) Sample B) Population
6) Among 50 of the 302 patients admitted to an emergency room during one month, 28% had no 6)
health insurance.
A) Sample B) Population
7) Based on a randomly selected group of 500 patients with high cholesterol, it was found that 67% 7)
have heart disease.
A) Sample B) Population
8) An investigation of 150 randomly selected local restaurants concluded that 42% of local 8)
restaurants have serious health code violations.
A) Sample B) Population
9) After inspecting all of 55,000 kg of meat stored at the Wurst Sausage Company, it was found 9)
that 45,000 kg of the meat was spoiled.
A) Population B) Sample
10) A health and fitness club surveys 40 randomly selected members and finds that the average 10)
weight of those questioned is 157 lb.
A) Population B) Sample
Determine whether the given value is a sample statistic or a population parameter.
11) A sample of 120 employees of a company is selected, and the average age is found to be 37 years. 11)
A) Sample statistic B) Population parameter
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, 12) A researcher examines the records of all the registered voters in one city and finds that 43% are 12)
registered Democrats.
A) Sample statistic B) Population parameter
13) A researcher determines that of all 25 year old women in her city, 37% are married. 13)
A) Sample statistic B) Population parameter
14) A researcher determines that 42.7% of all downtown office buildings have ventilation problems. 14)
A) Sample statistic B) Population parameter
15) After taking the first exam, 15 of the students dropped the class. 15)
A) Sample statistic B) Population parameter
16) A sample of 50 patients is selected from among the patients admitted to the emergency room at a 16)
hospital, and it is found that 28% have no health insurance.
A) Sample statistic B) Population parameter
17) Based on a sample of 500 patients with high cholesterol, it was found that 67% have heart 17)
disease.
A) Sample statistic B) Population parameter
18) An investigation of 150 randomly selected local restaurants concluded that 42% of local 18)
restaurants have serious health code violations.
A) Population parameter B) Sample statistic
19) After inspecting all of 55,000 kg of meat stored at the Wurst Sausage Company, it was found 19)
that 45,000 kg of the meat was spoiled.
A) Population parameter B) Sample statistic
20) A health and fitness club surveys 40 randomly selected members and finds that the average 20)
weight of those questioned is 157 lb.
A) Population parameter B) Sample statistic
Answer the question.
21) Following the Republican National Convention, a poll of 500 voters in a Central Illinois 21)
community showed that 56% expected the Republican ticket to win over the Democrat ticket no
matter whom the Democrats chose for vice-president. The margin of error was 3 percentage
points. There are 20,000 registered voters in the community. What is the range likely to contain
the population parameter?
A) 19,500 to 20,500 B) 265 to 295
C) 53% to 59% D) 10,600 to 11,800
22) Following the Republican National Convention, a poll of 800 voters in a Central Illinois 22)
community showed that 61% expected the Republican ticket to win over the Democrat ticket no
matter whom the Democrats chose for vice-president. The margin of error was 3 percentage
points. There are 22,000 registered voters in the community. What is the range likely to contain
the number of voters who expected the Republican ticket to win?
A) 58% to 64% B) 12,760 to 14,080
C) 21,512 to 22,488 D) 464 to 512
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,23) Based on a poll, a newspaper reported that between 52% and 68% of voters would be likely to 23)
vote for a school bond issue. What is the margin of error of the poll?
A) 10% B) 8% C) 26% D) 34%
24) Following the Republican National Convention, a poll of 700 voters in a Central Illinois 24)
community showed that 65% expected the Republican ticket to win over the Democrat ticket no
matter whom the Democrats chose for vice-president. The margin of error was 5 percentage
points. There are 24,000 registered voters in the community. What does the range 60% to 70%
represent?
A) The range likely to contain the percent of the population that expected the Republican
ticket to win
B) The range of the 800 persons polled who replied that they expected the Republican ticket
to win
C) The range that contains the percent of the population that expected the Republican ticket
to win
D) The range of voters nationally who expected the Republican ticket to win
25) A poll conducted the day before the student-body presidential election at a 19,000-student 25)
midwestern university showed that 51 percent favored Jesus, the rest favoring Yin Ling. The
margin of error was 3 percentage points. Since the poll showed that over half favored Jesus, Yin
Ling should have
A) expected to win, because Jesus would get 48% of the vote.
B) stayed in the race, because the likely population vote for Jesus is in a range containing less
than 50%.
C) conceded the race, because Jesus would get more than 50% of the vote on election day.
D) expected to lose, because she knew Jesus would get between 51% and 54%.
26) A poll of 494 citizens of Normal Illinois showed that 65% favored strict enforcement of speed 26)
limits with a margin of error of 4%. A second poll of 488 citizens of the same town showed that
37% favored strict enforcement of speed limits. Based on the results of the two polls, one may
conclude that
A) there are definite errors in one of the polls.
B) the percent of the population that favors strict enforcement of speed limits is
51% ± 4%.
C) the percent of the population that favors strict enforcement of speed limits is
51% ± 8%.
D) one or both of the samples may have been unlikely samples from the population.
27) In a recent published poll of 200 students at a midwestern university, 150, or 75%, said they 27)
would try to purchase used textbooks before buying new textbooks. The report stated that
somewhere between 70% and 80% of the students at the university would first try to purchase
used books. What is the margin of error?
A) 5% B) 25% C) 10% D) 75%
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, 28) In a survey of 80 football players who committed to play in the Division III CCIW conference, 64 28)
said that they would work out in their high school weight rooms in the summer before college.
The margin of error for the survey was 6%. A census of CCIW football players showed that 59%
worked out at their high schools. One can conclude that
A) the sample was an unlikely sample.
B) the census results are consistent with the confidence interval of the study.
C) the sample was less than forthcoming in their responses to the survey.
D) there must have been an error in the determination of the margin of error.
29) If 68% of the persons in a 100-person sample say that they approve of the actions of the city 29)
council with a margin of error of 5%, one can conclude that the number of persons in a
population of 2500 that approve of council policies is
A) probably in the interval 1575 to 1825. B) 1700.
C) 250. D) probably in the interval 1600 to 1800.
30) Of 54 college students interviewed, 36 said they were skeptical of statistical studies. The student 30)
conducting the study for the campus paper reported that between 15,000 and 17,000 of the
24,000 students on campus were skeptical of statistical studies. Which of the following is an
acceptable alternative to the original report?
A) "Two of every three students on campus are skeptical of statistic studies."
B) "If you are confident in the results of statistical studies, then the person on your left and
the person on your right in every class are skeptical of the results of statistical studies."
C) "Between 63% and 71% of students at the university are skeptical of statistical studies."
D) "A total of 16,000 students on this campus are skeptical of statistical studies."
Provide an appropriate response.
31) A poll of 700 persons attending the Taste of Chicago showed that 455 persons, 65% of the 31)
sample, believed that the food was overpriced. It is estimated that 1,250,000 persons attend the
Taste. Statistics suggest that, although 65% of attendees, with a margin of error of 5 percentage
points, believe that the food is overpriced, the Taste is a popular event. The raw data of the
study is
A) 65% of the sample.
B) the individual responses to the question.
C) 1,250,000 persons, 700 persons, 455 persons.
D) the margin of error, 5 percentage points.
32) In a reputable international survey of 2,500 pilots, it was found that 59% of them said that they 32)
have flown a plane while sleep deprived. The margin of error was 2.5 percentage points. The
raw data of the study is
A) 2,500 pilots, 2.5 percentage points
B) 59%
C) the individual responses to the question.
D) the total number of pilots currently flying.
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