GLOBAL CAMPUS STAT200 ASSIGNMENT
ACTUAL SUBMISSION 2026 SOLUTIONS
GRADED A+
◉ A randomly selected sample of 1,000 college students was asked
whether they had ever used the drug Ecstasy. Sixteen percent (16%
or 0.16) of the 1,000 students surveyed said they had. Which one of
the following statements about the number, 0.16 is correct? Answer:
It is a sample proportion
◉ According to a recent Gallup poll, about 60% of all American
adults owned a cell phone at the time of the poll. The results are
based on telephone interviews with a randomly selected national
sample of 998 adults, 18 years and older, conducted March 30-April
2, 2001. The margin of error was reported to be 3.5%. What was the
population of interest in this Gallup Poll? Answer: All American
Adults
◉ When the method for selecting subjects produces a sample that
does not represent the population of interest, the problem is called
Answer: selection bias
◉ When a representative sample is selected but only a small
proportion contacted actually participate in the study, the problem is
called Answer: non responsive bias
,◉ If the target population is all U.S. adults, then a telephone
directory would not make a good sampling frame because Answer:
people with unlisted numbers or not phones are not included
◉ According to a recent Gallup poll, about 60% of all American
adults owned a cell phone at the time of the poll. The results are
based on telephone interviews with a randomly selected national
sample of 998 adults, 18 years and older, conducted March 30-April
2, 2001. The 95% margin of error was reported to be 3.5%. Which of
the following statements correctly interprets the reported margin of
error of 3.5%? Answer: In about 95% of all random samples of this
size from the same population, the difference between the sample
percent and the population percent will be less than 3.5%.
◉ Which of the following is not true about drawing a simple random
sample from a population? Answer: D) It requires that the size of the
sample be no more than 5% of the size of the population.
◉ A magazine printed a survey in its monthly issue and asked
readers to fill it out and send it in. Over 1000 readers did so. This
type of sample is called a Answer: D) self-selected sample.
◉ Which of the following is the best example of a population from
which a cluster sample would be easier to obtain that a simple
, random sample? Answer: A) Passengers who will be flying in the
upcoming week on a certain airline.
◉ Decide if this study is experimental or observational. Answer:
Observational
◉ A national research firm was studying the amount of money spent
by Americans on coffee on a weekly basis in various regions of the
United States. They took a random sample of 5,000 Americans from
each region and asked how much they spent on coffee each week.
They found that on average individuals from the northeast spend
more money on coffee than individuals from any other region of the
United States. We cannot say that living in the northeast causes
people to spend more money on coffee (i.e., we cannot make a cause-
and-effect conclusion) because Answer: B) this study lacks random
assignment.
◉ A pharmaceutical company is testing the effectiveness of a new
non-steroidal anti-inflammatory drug at treating back pain. They
take a sample of 8,000 individuals with back pain. Half are randomly
assigned to receive the new drug and half are randomly assigned to
receive no treatment. The group that received the new drug
reported less pain than the group that received no drug. Which of
the following is true about this study? Answer: D) The study lacks a
placebo group.
ACTUAL SUBMISSION 2026 SOLUTIONS
GRADED A+
◉ A randomly selected sample of 1,000 college students was asked
whether they had ever used the drug Ecstasy. Sixteen percent (16%
or 0.16) of the 1,000 students surveyed said they had. Which one of
the following statements about the number, 0.16 is correct? Answer:
It is a sample proportion
◉ According to a recent Gallup poll, about 60% of all American
adults owned a cell phone at the time of the poll. The results are
based on telephone interviews with a randomly selected national
sample of 998 adults, 18 years and older, conducted March 30-April
2, 2001. The margin of error was reported to be 3.5%. What was the
population of interest in this Gallup Poll? Answer: All American
Adults
◉ When the method for selecting subjects produces a sample that
does not represent the population of interest, the problem is called
Answer: selection bias
◉ When a representative sample is selected but only a small
proportion contacted actually participate in the study, the problem is
called Answer: non responsive bias
,◉ If the target population is all U.S. adults, then a telephone
directory would not make a good sampling frame because Answer:
people with unlisted numbers or not phones are not included
◉ According to a recent Gallup poll, about 60% of all American
adults owned a cell phone at the time of the poll. The results are
based on telephone interviews with a randomly selected national
sample of 998 adults, 18 years and older, conducted March 30-April
2, 2001. The 95% margin of error was reported to be 3.5%. Which of
the following statements correctly interprets the reported margin of
error of 3.5%? Answer: In about 95% of all random samples of this
size from the same population, the difference between the sample
percent and the population percent will be less than 3.5%.
◉ Which of the following is not true about drawing a simple random
sample from a population? Answer: D) It requires that the size of the
sample be no more than 5% of the size of the population.
◉ A magazine printed a survey in its monthly issue and asked
readers to fill it out and send it in. Over 1000 readers did so. This
type of sample is called a Answer: D) self-selected sample.
◉ Which of the following is the best example of a population from
which a cluster sample would be easier to obtain that a simple
, random sample? Answer: A) Passengers who will be flying in the
upcoming week on a certain airline.
◉ Decide if this study is experimental or observational. Answer:
Observational
◉ A national research firm was studying the amount of money spent
by Americans on coffee on a weekly basis in various regions of the
United States. They took a random sample of 5,000 Americans from
each region and asked how much they spent on coffee each week.
They found that on average individuals from the northeast spend
more money on coffee than individuals from any other region of the
United States. We cannot say that living in the northeast causes
people to spend more money on coffee (i.e., we cannot make a cause-
and-effect conclusion) because Answer: B) this study lacks random
assignment.
◉ A pharmaceutical company is testing the effectiveness of a new
non-steroidal anti-inflammatory drug at treating back pain. They
take a sample of 8,000 individuals with back pain. Half are randomly
assigned to receive the new drug and half are randomly assigned to
receive no treatment. The group that received the new drug
reported less pain than the group that received no drug. Which of
the following is true about this study? Answer: D) The study lacks a
placebo group.
