Copyright

Identifying Bias in Sample Selection

  • 1.

    Eric wants to know if gamers prefer physical or digital copies of games. He conducts a survey by asking random shoppers at a nearby brick-and-mortar video game store. Identify a possible bias in the sample selection.

    Answers:

    • There is no potential bias in his sample selection.

    • He is conducting a survey for a limited amount of time, which means he is only asking customers who shop on a certain day.

    • He is conducting a survey exclusively at a brick-and-mortar store, which means customers will already have a preferred bias for physical copies of games.

    • He is conducting a survey exclusively a brick-and-mortar store, which means the customers will already have a preferred bias for digital copies of games.

  • 2.

    To resolve the inquiry of if gamers prefer physical or digital copies of games, Erik decides to research it. He conducts a survey by asking random shoppers at a nearby brick-and-mortar video game store on their opinion. What is the population being sampled by Eric's survey?

    Answers:

    • Customers who shop at the nearby brick-and-mortar video game store.

    • Customers who are interested in purchasing video games.

    • Customers who shop online for video games.

    • All video game players.

  • 3.

    Eric wants to know if video game players prefer to purchase physical or digital copies of video games. He plans to conduct a survey by asking shoppers at random at the nearby brick-and-mortar video game store. What is the reason for obtaining a sample for Eric's survey?

    Answers:

    • The survey being conducted is to determine what type of video game format they prefer to own.

    • The survey being conducted is to determine how often people purchase physical copies of video games.

    • The survey being conducted is to determine how often people purchase digital copies of video games.

    • They survey being conducted is to find out the shopping habits of customers at the nearby brick-and-mortar video game store.

  • 4.

    Wondering if there's a correlation between student reading habits and their grades, Pauline decides to perform a study. She conducts a survey by asking students who come into the school library over the course of a week. Identify the reason for obtaining a sample for Pauline's survey.

    Answers:

    • Pauline wishes to determine what portion of the student population actively uses the library for studying.

    • Pauline wants to determine if there is a correlation between student reading habits and their overall grade performance.

    • Pauline wants to determine if there's a correlation between student reading habits and their attendance.

    • Pauline wants to find out how often students check out books from the school library for study purposes.

  • 5.

    Pauline wants to find out if there's a correlations between student reading habits and their grades. She conducts a survey by asking students who come into the school library over the course of a week. Identify the population that were surveyed in Pauline's sample.

    Answers:

    • All students at her school.

    • Students at her school who were in attendance that week.

    • People who visit the library.

    • Students at her school who visit the school library.

  • 6.

    Pauline wants to find out if there's a correlations between student reading habits and their grades. She conducts a survey by asking students who come into the school library over the course of a week. Identify a potential bias in Pauline's sample selection.

    Answers:

    • Students who visit the school library are more likely to be active readers than students who don't visit the school library, which would skew the results towards students who read more.

    • There are no potential biases in her sample selection.

    • Pauline only did the survey for a week, meaning she excluded any students that did not attend class for that week.

    • Students who visit the school library are more likely to have higher grades than students who don't visit the school library, which would skew Pauline's survey results.

  • 7.

    A research company is conducting a survey regarding the driving habits of Americans. Using US census data, they mail out 3000 surveys to randomly selected households across all fifty states, and give them a response time window of about six months. Determine the reason for the survey.

    Answers:

    • To determine which state has more drivers than other states.

    • To determine the driving habits of American drivers.

    • To determine the driving habits of the American population.

    • Not enough information given.

  • 8.

    To learn about the driving habits of Americans, a research company has been hired to conduct a study. Using the latest US Census Data, they mailed out 3000 surveys to randomly selected households across all fifty states, and gave them a response time window of about six months. What is the population being sampled for this survey?

    Answers:

    • All Americans who drive.

    • All Americans currently living in the United States.

    • All Americans currently living on the mainland of the United States.

    • All Americans who own a car.

  • 9.

    A research company is conducting a survey regarding the driving habits of Americans. Using the latest US Census Data, they mailed out 3000 surveys to randomly selected households across all fifty states, and gave them a response time window of about six months. Can you identify a potential bias that would unfairly skew the results of the data?

    Answers:

    • The research company did not use a random sample, which may skew the results based on the criteria they selected their sample with.

    • The research company sent surveys to Americans in select states, meaning they would only get the driving habits of residents within those specific states.

    • There are no significant biases that'd skew the results of the data.

    • The research company sent surveys to Americans that owned cars, meaning they would not get much data on Americans who don't own a car.

  • 10.

    Antonio is looking into the most popular movie genres among the students at his high school. He passes out surveys to all members of the anime club and the film club. What is Antonio's reason for gathering data?

    Answers:

    • Antonio wants to know the most popular genre of film among the student body at his school.

    • Antonio wants to know the most popular genre of film among the film club members at his school.

    • Antonio wants to know the most popular genre of film among the anime club and film club members at his school.

    • Antonio wants to know the most popular genre of film among the anime club members at his school.

  • 11.

    Antonio is curious about the most popular movie genres among students at his school, so he decides to find out. He passes out surveys to all members of the anime club and the film club. What is the population that Antonio selected his sample from?

    Answers:

    • Students that enjoy anime and/or films.

    • Students that are members of the anime and/or film clubs.

    • All students at his high school.

    • Students that enjoy anime or film, but not both.

  • 12.

    Antonio wishes to know the most popular movie genre among the students at his high school. He passes out surveys to all members of the anime club and the film club, asking about their opinions. What is a potential bias from his sample selection process that could skew the results?

    Answers:

    • Students who are members of either club already have a heavy bias towards the topic being asked. The sample leaves out students who are not in those clubs and may have a differing opinion on movies.

    • Students who are members of either club are not necessarily all students at that high school, this means it could give him unnecessary data.

    • There is no potential bias in his sample selection method.

    • Students who are members of the anime club are probably not interested in feature length films, so asking them may skew the results heavily in their favor.

  • 13.

    As per her job as the fair market researcher, Alisa is looking into what's the most popular food item at the fair. Standing near the cookie vendor, she takes a tally of the customer orders throughout the fair. What is the purpose of Alisa's study?

    Answers:

    • Determining how many people purchase food at the fair.

    • Determining the most popular food item at the fair.

    • Determining what is the most popular cookie at the fair.

    • Determining how many people buy cookies at the fair.

  • 14.

    Alisa is looking into what's the most popular food item at the fair. She takes a tally of the customer orders throughout the fair while standing near the cookie vendor. Identify the population that Alisa selected her sample from.

    Answers:

    • Visitors to the fair that purchased cookies.

    • All visitors to the fair.

    • Visitors to the fair that purchased food.

    • Everyone at the fair, employees included.

  • 15.

    Alisa is researching what's the most popular food item at the fair. Standing near the cookie vendor, she takes a tally of the customer orders throughout the fair. What is a potential issue of bias with Alisa's sample selection?

    Answers:

    • By not tallying people not buying food, she is giving a bias towards fair visitors that are buying food for her study.

    • By only tallying people at the fair, she is excluding people who may have differing opinions on fair food.

    • By standing near the cookie vendor, she will be paying attention mostly to people who purchase cookies and not visitors who purchase other types of food.

    • There is no potential issue of bias in Alisa's sample selection.

  • 16.

    Delphi the content creator wants to know what kind of videos her general audience wants to see. She posts a survey in the newsletter that gets sent out to folks with a special paid membership to her channel. What is the reason she needs a population sample?

    Answers:

    • Delphi wants to know how many special paid members read the newsletter.

    • Delphi wants to know who is her general audience.

    • Delphi wants to know what kind of content her special paid members would like to see.

    • Delphi wants to know kind of content her entire audience would like to see.

  • 17.

    Delphi the video creator, wanting to branch out from her usual forma, wants to know what kind of videos her general audience would be interested in watching. She puts a survey in the newsletter that gets sent out to folks with a special paid membership to her channel. What is the population that she's selecting her sample from?

    Answers:

    • Everyone who watches her channel.

    • Everyone who has a special paid membership to her channel.

    • Everyone who is a regular viewer of her channel.

    • Everyone who has internet access.

  • 18.

    Delphi the content creator wants to expand the type of videos she makes. So she needs to know what kind of videos her general audience wants to see. She posts a survey in the newsletter that gets sent out to folks with a special paid membership to her channel. Identify a bias in Delphi's sample selection that affect the results.

    Answers:

    • She only gave the survey to viewers that have a special paid membership, and not the general audience. This will highly skew the survey results towards people who already have a high investment level in the type of content she currently makes.

    • There is no potential bias in her sample selection.

    • She only gave the survey to viewers that view her channel, and not everyone on the internet. This will highly skew the survey results towards people who already have some investment in the content she currently makes.

    • By giving a multiple choice survey rather than an open ended suggestion box, she has limited the possible responses and thus giving a bias towards specific choices.

  • 19.

    A high school is attempting to decide who their new mascot should be, and want the students to have a voice in the decision making process. They create a poll and post it online publicly to their social media account. They post reminders about the survey multiple times throughout the week, to encourage participation. What is the reasoning for the school gathering data from the population?

    Answers:

    • They want the general public's input on the school's new mascot.

    • They want ideas for a new mascot.

    • They want student input on the school's new mascot.

    • They want to know how many students care about school mascots.

  • 20.

    A high school is attempting to decide who their new mascot should be, and want the students to have a voice in the decision making process. They create a poll and post it online publicly to their social media account. What is the population they are selecting a sample from?

    Answers:

    • The students currently attending their school.

    • Past and present students at the school.

    • Mutual followers of the school's social media account.

    • The internet at large.

  • 21.

    A high school is trying to decide who their new mascot should be, and they want their students to have a voice in the decision making process. To do so, they create a poll and post it online publicly to their social media account. They post reminders about the survey multiple times throughout the week to encourage participation. What is the largest potential bias issue with this method of sample selection?

    Answers:

    • Social media posts have a tendency to get buried under other content, so the survey may get lost and overlooked by people who weren't online at the time of the posting.

    • They have opened the poll to the general public rather than just the students at the school. It is possible they will get a large amount of votes from people who are not a part of their originally intended population.

    • There is no issue of potential bias in the sample selection.

    • They have posted the poll on the school social media account, which could potentially leave out any students that don't pay attention to social media out.

  • 22.

    Angie is running a chili taste test competition that she herself is participating in. She asked ten of her good friends to be judges, who will be surveyed and asked to rank each chili entry on a ten point scale for a number of different criteria. What is the purpose of the survey?

    Answers:

    • To determine which contestant is most popular.

    • To determine which chili tastes the best.

    • To determine the value of chili.

    • To determine how much the judges like chili.

  • 23.

    At her workplace, Angie decides to hold a chili making contest which she herself is participating in. She asked ten of her good friends to be judges, who will be surveyed and asked to rank each chili entry by a number of criteria. What is the population that she selected judges from?

    Answers:

    • Her friends.

    • People who enjoy chili.

    • Anyone who can eat.

    • People who have experience with judging.

  • 24.

    Angie is running a chili taste test competition at her workplace that she herself is participating in. She asked ten of her good friends to be judges, who will be surveyed and asked to rank each chili entry by a number of criteria. Identify the largest bias in Angie's sample selection process.

    Answers:

    • There is no bias in the sample selection process.

    • By selecting judges that are friends with her while she is a participant, it will give her an unfair advantage in the competition as they may vote for her friend.

    • By selecting judges that like to eat chili, she may get results that will skew towards dishes that taste more like chili than the others.

    • By selecting only ten judges, that will give an invalid response as the sample size is too small.

  • 25.

    Erik wants to learn more about immigration patterns in the first half of the 20th century. Since there are too many records to go through, he decides to read up on the immigration files that took place during 1905 as his sample selection. What is the main purpose of Erik's research process and sample selection?

    Answers:

    • To see which years were most popular for immigration in the first half of the 20th century.

    • To learn more about the immigration patterns in 1905.

    • To learn more about the immigration patterns in the first half of the 20th century.

    • To see how many people immigrated in the first half of the 20th century.

  • 26.

    Erik is trying to learn more about immigration patterns during the first half of the 20th century (1900-1950). Since there are too many records to go through, he decides to read up on the immigration files that were created in 1905, randomly selecting a sample of those files. What is the population that Erik is drawing from?

    Answers:

    • All records that were created in 1905.

    • Immigration records that were created in 1905.

    • All immigration records that were ever created.

    • Immigration records that were created in the first half of the 20th century.

  • 27.

    Erik is trying to learn more about immigration patterns during the first half of the 20th century (1900-1950). Since there are too many records to go through, he decides to read up on the immigration files that were created in 1905, randomly selecting a sample of those files. Determine a potential bias in Erik's sample selection that may affect the results.

    Answers:

    • Since he is randomly selecting a set number of files to read through, it will not paint an accurate picture of what immigration was like during the first half of the 20th century.

    • Since he only selected files that were created about immigration, it would heavily skew his results in favor to reflect the stories of immigrants rather than the story of everyone that lived during the first half of the 20th century.

    • There is no potential bias in Erik's sample selection process.

    • Since he only selected files that were created in a single year, it would heavily skew the results to reflect what occurred only in 1905. One year is not nearly a wide enough scope to cover an entire 50 years of history.

  • 28.

    Justine wishes to find out what kinds of foods are most popular among the high schoolers at her school. She creates a survey, which she distributes among a few randomly selected homerooms from each grade level. What is the reason for her study?

    Answers:

    • To determine if there's a trend of specific dietary habits among her grade.

    • To determine the kinds of food most popular at her school.

    • To determine how much food students at her school consume.

    • To determine what types of students attend her school.

  • 29.

    Justine is researching what type of foods are most popular among the students at her school. She creates a survey, which she distributes among a few randomly selected homerooms from each grade level. What's the population that she's selecting her sample from?

    Answers:

    • All current students at her school.

    • All students at her grade level.

    • Everyone who consumes food.

    • All past and present students at her school.

  • 30.

    Justine wants to know what type of foods are most popular among the high schoolers at her school. To get the results she wants, she distributes a survey to several different homerooms that were randomly selected across each grade level. Identify any potential biases in her sample selection that may skew the results of her survey.

    Answers:

    • By selecting homerooms that are in her school, it will limit the results to students who are attending her school, excluding students that attend different schools.

    • By selecting homerooms that are across all grade levels, her results will be skewed to reflect the food preferences of all students at her school rather than students at her grade level.

    • There are no potential biases that will skew the results of her survey.

    • By randomly selecting homerooms, she may get an unexpected result than if she had selected homerooms with students that she's familiar with.

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