You have probably seen the mall interviewer, clipboard in hand, approaching people passing by. To estimate...

Transcribed Image Text:

You have probably seen the mall interviewer, clipboard in hand, approaching people passing by. To estimate the mean amount of money that city residents plan to spend on holiday gifts, the interviewer surveys 100 mall shoppers. This sampling method (convenience sampling) is biased because the people at the mall are there to spend money. As a result, the mean amount reported by the people in the sample is likely greater than the mean amount that all city residents plan to spend. Explain how to avoid the bias described in the problem. Instead of sampling at the mall, the interviewer could obtain a list of all city residents and [Select] list to be surveyed. If from this [Select] is used instead of convenience sampling, no personal choice is involved and the sample should be [Select] representative of all city residents. Sammy wants to know what percent of students at her high school have a driver's license. She surveys all students in her statistics class and finds that 68% of the students in her sample have a driver's license. What type of sample did Sammy obtain? Convenience sample Voluntary response sample A random sample A census Question 3 2 pts Randomly selecting our samples is important because it helps to reduce In 2016, Britain's Natural Environment Research Council invited the public to name its new $300 million polar research ship. To vote on the name, people simply needed to visit a website and record their choice. Ignoring names suggested by the council, more than 124,000 people voted for "Boaty McBoatface," which ended up having more than 3 times as many votes as the second-place finisher. Explain why this sampling method is biased. This sampling method (voluntary response sampling) is biased because it is likely that people who took the time to go online and vote did so to amuse themselves by voting for a silly name. The sampling method (convenience sampling) is biased because this is an observational study. The sampling method (voluntary response sampling) is biased because this is an observational study. This sampling method (convenience sampling) is biased because it is likely that people who took the time to go online and vote did so to amuse themselves by voting for a silly name. Newspaper readers sometimes write letters to the editor, hoping that their opinions will be published in the paper. The editorial staff at a local newspaper keeps track of the content of each letter that is submitted. After a controversial decision made by the mayor, 90% of the letters to the editor expressed opposition to the mayor's action. Explain why this sampling method is biased. The sampling method (convenience sampling) is biased because this is an observational study. This sampling method (voluntary response sampling) is biased because it is likely that those newspaper readers who chose to write letters feel strongly about the mayor's decision, often in opposition. The sampling method (voluntary response sampling) is biased because this is an observational study. This sampling method (convenience response sampling) is biased because it is likely that those newspaper readers who chose to write letters feel strongly about the mayor's decision, often in opposition. You have probably seen the mall interviewer, clipboard in hand, approaching people passing by. To estimate the mean amount of money that city residents plan to spend on holiday gifts, the interviewer surveys 100 mall shoppers. This sampling method (convenience sampling) is biased because the people at the mall are there to spend money. As a result, the mean amount reported by the people in the sample is likely greater than the mean amount that all city residents plan to spend. Explain how to avoid the bias described in the problem. Instead of sampling at the mall, the interviewer could obtain a list of all city residents and [Select] list to be surveyed. If from this [Select] is used instead of convenience sampling, no personal choice is involved and the sample should be [Select] representative of all city residents. Sammy wants to know what percent of students at her high school have a driver's license. She surveys all students in her statistics class and finds that 68% of the students in her sample have a driver's license. What type of sample did Sammy obtain? Convenience sample Voluntary response sample A random sample A census Question 3 2 pts Randomly selecting our samples is important because it helps to reduce In 2016, Britain's Natural Environment Research Council invited the public to name its new $300 million polar research ship. To vote on the name, people simply needed to visit a website and record their choice. Ignoring names suggested by the council, more than 124,000 people voted for "Boaty McBoatface," which ended up having more than 3 times as many votes as the second-place finisher. Explain why this sampling method is biased. This sampling method (voluntary response sampling) is biased because it is likely that people who took the time to go online and vote did so to amuse themselves by voting for a silly name. The sampling method (convenience sampling) is biased because this is an observational study. The sampling method (voluntary response sampling) is biased because this is an observational study. This sampling method (convenience sampling) is biased because it is likely that people who took the time to go online and vote did so to amuse themselves by voting for a silly name. Newspaper readers sometimes write letters to the editor, hoping that their opinions will be published in the paper. The editorial staff at a local newspaper keeps track of the content of each letter that is submitted. After a controversial decision made by the mayor, 90% of the letters to the editor expressed opposition to the mayor's action. Explain why this sampling method is biased. The sampling method (convenience sampling) is biased because this is an observational study. This sampling method (voluntary response sampling) is biased because it is likely that those newspaper readers who chose to write letters feel strongly about the mayor's decision, often in opposition. The sampling method (voluntary response sampling) is biased because this is an observational study. This sampling method (convenience response sampling) is biased because it is likely that those newspaper readers who chose to write letters feel strongly about the mayor's decision, often in opposition.