3.12 Biased Sample practice

In a study where a researcher sends out 500 questionnaires about pollution in Cincinnati to local residents by mail and receives 340 responses... what type of technology does the researcher use to collect data on household phone ownership?

• Mobile phones

• mail

• Landline phones

• Personal interviews

Tags

CCSS.6.SP.B.5B

In a study where a researcher sends out 500 questionnaires about pollution in Cincinnati to local residents by mail and receives 340 responses, why might the sample be biased ? (Select all that apply.)

• Even if the researcher randomly selected the participants, not all of them mailed back their responses.

• The questionnaire was too long

• We don’t know how she selected the 500 residents to send the questionnaires to

• Everyone in Cincinnati didn't receive the questionnaire

Tags

CCSS.RL.11-12.6

In a study where a researcher sends out 500 questionnaires about pollution in Cincinnati to local residents by mail and receives 340 responses, what is the population of interest?

• the 340 local people who responded

• all Cincinnati residents

• the 500 questionnaires

• special teams

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A researcher is interested in learning the typical number people per household who own cell phones. He conducts a survey by randomly calling phones that have land-lines. Why might this sample be biased?

• People with only cell phones are not included

• Calls are made only during business hours

• The sample size is too small

• The researcher calls multiple times

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

A researcher is interested in learning the typical number people per household who own cell phones. He conducts a survey by randomly calling phones that have land-lines. What is the population of interest?

• All households with cell phones.

• All households (possibly in the United States, but this is unclear).

• Only households with land-lines.

• Special players.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

Why might a sample be considered biased if a researcher concludes that dolphins are nice animals by surveying people who were assisted by a dolphin in a shark attack?

• Not all people have encountered dolphins

• The survey was conducted online

• Only people who like dolphins responded

• People surveyed had a positive experience with dolphins

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

If a researcher concludes that dolphins are nice animals by surveying people who were assisted by one in a shark attack, what is the population of interest?

• all sharks

• only people that have been attacked by sharks

• all dolphins

• special plays

In a scenario where a radio station host asks her listeners to call in and state if they enjoy the "Daily Dilemma" segment, why might the resulting sample be biased? (Select all that apply.)

• People who call in are going to have the strong opinions of either loving it or hating it so many moderate opinions of people are excluded.

• All listeners enjoy the segment so what is the point of asking people to call in?

• The segment is not popular in the area so no one will call in which would exclude many opinions.

• People who don't like the "Daily Dilemma" segment will not call in because they are not listening so she'll have more people call in who like it.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1

In a study where a researcher asks UC students about pet ownership as they enter a health center, what is the population of interest?

• Only students visiting the UC health center

• All UC students who own pets

• All UC students

• All UC pets

In a study where a researcher asks UC students about pet ownership as they enter a health center, why might the sample be biased?

• It is unlikely that the entire UC student body would be represented by this subset of students who visit the student health center during that particular day and time.

• UC students who are sick and visiting the health center would have less pets than those who don't visit the health center.

• UC students who visit the health center on Tuesdays are special.

• All UC students have cats because they are the bearcats.

Tags

CCSS.7.SP.A.1

CCSS.HSS.IC.A.1