Prob/Stats - Data Collection Review

Which of the following is NOT likely to cause response bias?

To test for quality, a bottling company selects 10 cans every hour to see if the volume is within an acceptable range.

Each week, the Gallup Poll surveys about 1500 adult U.S. residents to determine current opinions on a variety of issues.

The SCA at a high school surveys 100 students at the school to get their opinions about a change to the bell schedule.

The design of a statistical study shows bias if it consistently underestimates or overestimates a value in the study.

Which of the follwoing best describes confounding?

To test for quality, a bottling company selects 10 cans every hour to see if the volume is within an acceptable range.

Each week, the Gallup Poll surveys about 1500 adult U.S. residents to determine current opinions on a variety of issues.

Blinding in experimental design can mean that a subject or the researcher do not know which group they are in.

"How much money do high-school students carry with them?" is a statistical question.

Which of the following is an experiment?

Which of the following is an observational study.

Nonresponse occurs when an individual chosen for the sample can’t be contacted or refuses to participate.

"How many quarters equal $10?" is a statistical question.

The SCA at a high school surveys 100 students at the school to get their opinions about a change to the bell schedule.

"What percent of U.S. residents think the president is doing a good job?" is a statistical question.

Blocking refers to

A random sample of 1000 people will be more accurate than a random sample of 100 people.

Undercoverage occurs when all members of the population are equally likely to be chosen for the sample.

Which of the following methods of sampling would lead to the least bias?

"How many electoral votes did Barack Obama receive in 2012?" is a statistical question.