Question 1

SCENARIO 8-11
A poll was conducted by the marketing department of a video game company to determine
the popularity of a new game that was targeted to be launched in three months.Telephone
interviews with 1,500 young adults were conducted which revealed that 49% said they would
purchase the new game.The margin of error was  3 percentage points.
-True or False: Referring to Scenario 8-11, the sampling error is 3%.

Accepted Answer

The sampling error is the difference between the sample mean and the population mean. In this case, the sample mean is 52% and the population mean is 55%. The difference between these two values is 3%, so the sampling error is 3%.

Question 2

SCENARIO 8-11
A poll was conducted by the marketing department of a video game company to determine
the popularity of a new game that was targeted to be launched in three months.Telephone
interviews with 1,500 young adults were conducted which revealed that 49% said they would
purchase the new game.The margin of error was  3 percentage points.
-True or False: Referring to Scenario 8-11, the standard error is 3%.

Accepted Answer

The statement does not provide enough context or information about Scenario 8-11 to determine the standard error.

Question 3

SCENARIO 8-10
A sales and marketing management magazine conducted a survey on salespeople cheating on
their expense reports and other unethical conduct.In the survey on 200 managers, 58% of the
managers have caught salespeople cheating on an expense report, 50% have caught
salespeople working a second job on company time, 22% have caught salespeople listing a
"strip bar" as a restaurant on an expense report, and 19% have caught salespeople giving a
kickback to a customer.
-True or False: Referring to Scenario 8-10, it is possible that the 95% confidence interval
calculated from the data will not contain the sample proportion of managers who have caught
salespeople cheating on an expense report.

Accepted Answer

A 95% confidence interval is constructed around the sample proportion, so it will always contain the sample proportion itself.

Question 4

SCENARIO 8-11
A poll was conducted by the marketing department of a video game company to determine
the popularity of a new game that was targeted to be launched in three months.Telephone
interviews with 1,500 young adults were conducted which revealed that 49% said they would
purchase the new game.The margin of error was  3 percentage points.
-Referring to Scenario 8-11, 1,500 is the size of the
A) population
B) sample
C) frame
D) proportion

Accepted Answer

The sample size of 1,500 young adults is the group that was surveyed in order to gather data about the game's popularity. Therefore, B is the best choice as it represents the size of the sample. A population refers to the entire group of individuals being studied, a frame refers to the list or source from which the sample is drawn, and a proportion refers to the fraction or percentage of individuals in the sample who have a certain characteristic or opinion.

Question 5

SCENARIO 8-11
A poll was conducted by the marketing department of a video game company to determine
the popularity of a new game that was targeted to be launched in three months.Telephone
interviews with 1,500 young adults were conducted which revealed that 49% said they would
purchase the new game.The margin of error was  3 percentage points.
-Referring to Scenario 8-11, what is the needed sample size to obtain a 95% confidence
interval in estimating the percentage of the targeted young adults who will purchase the new
game to within  
5%?

Accepted Answer

The answer of SCENARIO 8-11
A poll was conducted by the...

Question 6

SCENARIO 8-9
A university wanted to find out the percentage of students who felt comfortable reporting
cheating by their fellow students.A surveyed of 2,800 students was conducted and the
students were asked if they felt comfortable reporting cheating by their fellow students.The
results were 1,344 answered "Yes" and 1,456 answered "no".
-True or False: Referring to Scenario 8-9, we are 99% confident that the total number of the
student population who feel comfortable reporting cheating by their fellow students is
between 0.4557 and 0.5043.

Accepted Answer

The answer of SCENARIO 8-9
A university wanted to find out...

Question 7

SCENARIO 8-11
A poll was conducted by the marketing department of a video game company to determine
the popularity of a new game that was targeted to be launched in three months.Telephone
interviews with 1,500 young adults were conducted which revealed that 49% said they would
purchase the new game.The margin of error was  3 percentage points.
-Referring to Scenario 8-11, what is the needed sample size to obtain a 95% confidence
interval in estimating the percentage of the targeted young adults who will purchase the new
game to within  
5% if you do not have the information on the 49% in the interviews who
said that they would purchase the new game?

Accepted Answer

The answer of SCENARIO 8-11
A poll was conducted by the...

Question 8

SCENARIO 8-9
A university wanted to find out the percentage of students who felt comfortable reporting
cheating by their fellow students.A surveyed of 2,800 students was conducted and the
students were asked if they felt comfortable reporting cheating by their fellow students.The
results were 1,344 answered "Yes" and 1,456 answered "no".
-True or False: Referring to Scenario 8-9, it is possible that the 99% confidence interval
calculated from the data will not contain the sample proportion of students who feel
comfortable reporting cheating by their fellow students.

Accepted Answer

A confidence interval is constructed around the sample proportion, so it will always contain the sample proportion itself.

Question 9

SCENARIO 8-10
A sales and marketing management magazine conducted a survey on salespeople cheating on
their expense reports and other unethical conduct.In the survey on 200 managers, 58% of the
managers have caught salespeople cheating on an expense report, 50% have caught
salespeople working a second job on company time, 22% have caught salespeople listing a
"strip bar" as a restaurant on an expense report, and 19% have caught salespeople giving a
kickback to a customer.
-True or False: Referring to Scenario 8-10, a 95% confidence interval will contain 95% of
the population proportion of managers who have caught salespeople cheating on an expense
report.

Accepted Answer

A 95% confidence interval estimates the range within which the true population proportion is likely to fall, not that it contains 95% of the population proportion.

Question 10

SCENARIO 8-11
A poll was conducted by the marketing department of a video game company to determine
the popularity of a new game that was targeted to be launched in three months.Telephone
interviews with 1,500 young adults were conducted which revealed that 49% said they would
purchase the new game.The margin of error was  3 percentage points.
-Referring to Scenario 8-11, what is the needed sample size to obtain a 95% confidence
interval estimate of the percentage of the targeted young adults who will purchase the new
game by allowing the same level of margin of error?

Accepted Answer

The answer of SCENARIO 8-11
A poll was conducted by the...

Question 11

SCENARIO 8-9
A university wanted to find out the percentage of students who felt comfortable reporting
cheating by their fellow students.A surveyed of 2,800 students was conducted and the
students were asked if they felt comfortable reporting cheating by their fellow students.The
results were 1,344 answered "Yes" and 1,456 answered "no".
-True or False: Referring to Scenario 8-9, it is possible that the 99% confidence interval
calculated from the data will not contain the proportion of the student population who feel
comfortable reporting cheating by their fellow students.

Accepted Answer

A confidence interval provides a range of values within which the true population parameter is expected to fall, but there is still a small chance (1% in this case) that the true proportion lies outside this interval.

Question 12

SCENARIO 8-11
A poll was conducted by the marketing department of a video game company to determine
the popularity of a new game that was targeted to be launched in three months.Telephone
interviews with 1,500 young adults were conducted which revealed that 49% said they would
purchase the new game.The margin of error was  3 percentage points.
-Referring to Scenario 8-11, what is the needed sample size to obtain a 90% confidence
interval estimate of the percentage of the targeted young adults who will purchase the new
game by allowing the same level of margin of error?

Accepted Answer

The answer of SCENARIO 8-11
A poll was conducted by the...

Question 13

SCENARIO 8-11
A poll was conducted by the marketing department of a video game company to determine
the popularity of a new game that was targeted to be launched in three months.Telephone
interviews with 1,500 young adults were conducted which revealed that 49% said they would
purchase the new game.The margin of error was  3 percentage points.
-True or False: Referring to Scenario 8-11, you are 99% confidence that the percentage of
the targeted young adults who will purchase the new game is somewhere between 46% and
52%.

Accepted Answer

The statement implies a confidence interval, but without the specific context or data from Scenario 8-11, it's impossible to confirm the exact confidence interval range.

Question 14

SCENARIO 8-11
A poll was conducted by the marketing department of a video game company to determine
the popularity of a new game that was targeted to be launched in three months.Telephone
interviews with 1,500 young adults were conducted which revealed that 49% said they would
purchase the new game.The margin of error was  3 percentage points.
-Referring to Scenario 8-11, what is the needed sample size to obtain a 99% confidence
interval in estimating the percentage of the targeted young adults who will purchase the new
game to within ±5% if you do not have the information on the 49% in the interviews who
said that they would purchase the new game?

Accepted Answer

The answer of SCENARIO 8-11
A poll was conducted by the...

Question 15

SCENARIO 8-11
A poll was conducted by the marketing department of a video game company to determine
the popularity of a new game that was targeted to be launched in three months.Telephone
interviews with 1,500 young adults were conducted which revealed that 49% said they would
purchase the new game.The margin of error was  3 percentage points.
-True or False: Referring to Scenario 8-11, the size of the population is 1,500.

Accepted Answer

Without the details of Scenario 8-11, it is impossible to determine the size of the population.

Question 16

SCENARIO 8-11
A poll was conducted by the marketing department of a video game company to determine
the popularity of a new game that was targeted to be launched in three months.Telephone
interviews with 1,500 young adults were conducted which revealed that 49% said they would
purchase the new game.The margin of error was  3 percentage points.
-True or False: Referring to Scenario 8-11, the report contains all the essential components
for an ethical reporting of poll results.

Accepted Answer

The statement cannot be verified as true or false without specific details about Scenario 8-11 and the components of the report.

Question 17

SCENARIO 8-9
A university wanted to find out the percentage of students who felt comfortable reporting
cheating by their fellow students.A surveyed of 2,800 students was conducted and the
students were asked if they felt comfortable reporting cheating by their fellow students.The
results were 1,344 answered "Yes" and 1,456 answered "no".
-True or False: Referring to Scenario 8-9, a confidence interval estimate of the population
proportion would only be valid if the distribution of the number of students who feel
comfortable reporting cheating by their fellow students is normal.

Accepted Answer

A confidence interval for a proportion does not require the population distribution to be normal; it requires a large enough sample size for the sampling distribution of the proportion to be approximately normal, which is typically satisfied by the sample size in this scenario.

Question 18

SCENARIO 8-10
A sales and marketing management magazine conducted a survey on salespeople cheating on
their expense reports and other unethical conduct.In the survey on 200 managers, 58% of the
managers have caught salespeople cheating on an expense report, 50% have caught
salespeople working a second job on company time, 22% have caught salespeople listing a
"strip bar" as a restaurant on an expense report, and 19% have caught salespeople giving a
kickback to a customer.
-True or False: Referring to Scenario 8-10, it is possible that the 95% confidence interval
calculated from the data will not contain the population proportion of managers who have
caught salespeople cheating on an expense report.

Accepted Answer

A 95% confidence interval provides an estimate that has a 5% chance of not containing the true population proportion, so it is possible that the interval does not include the actual proportion.

Question 19

SCENARIO 8-9
A university wanted to find out the percentage of students who felt comfortable reporting
cheating by their fellow students.A surveyed of 2,800 students was conducted and the
students were asked if they felt comfortable reporting cheating by their fellow students.The
results were 1,344 answered "Yes" and 1,456 answered "no".
-True or False: Referring to Scenario 8-9, a 90% confidence interval calculated from the
same data would be narrower than a 99% confidence interval.

Accepted Answer

A 90% confidence interval is narrower than a 99% confidence interval because it has a lower confidence level, meaning it requires less certainty and thus has a smaller range.

Quiz 8: Confidence Interval Estimation