Sampling Methods and Bias

A statistics teacher wants to know how her students feel about an introductory statistics course. There are four ranks of students taking the class: freshman, sophomores, juniors, and seniors. She randomly selects 15 students from each class rank. What sampling method did the teacher use?

• Simple Random Sample

• Stratified Random Sample

• Systematic Random Sample

• Cluster Sample

A statistics teacher wants to know how her students feel about an introductory statistics course. Each student has a nine-digit student number. The teacher randomly selects 60 numbers. What sampling method did the teacher use?

• Simple Random Sample

• Stratified Random Sample

• Systematic Random Sample

• Cluster Sample

A statistics teacher wants to know how her students feel about an introductory statistics course. She randomly select one class rank (freshmen, sophomores, juniors, seniors) and surveys every student in that class rank. What could go wrong?

• Undercoverage Bias

• Nonresponse Bias

• Response Bias

• Voluntary Response Sample

• Convenience Sample

Management at a retail store is concerned about the possibility of drug abuse by people who work there. They decide to check the extent of the problem by randomly selecting an employee classification (supervisors, full-time clerks, part-time clerks, maintenance staff) and testing all the people who work in that classification. What sampling method did management use?

• Simple Random Sample

• Stratified Random Sample

• Systematic Random Sample

• Cluster Sample

Management at a retail store is concerned about the possibility of drug abuse by people who work there. They decide to check the extent of the problem by testing every fifth person that arrives at work. What sampling method did management use?

• Simple Random Sample

• Stratified Random Sample

• Systematic Random Sample

• Cluster Sample

Management decides to offer additional employee discounts for those employees that agree to be drug tested. What is the problem with this method?

• Undercoverage Bias

• Nonresponse Bias

• Response Bias

• Voluntary Response Sample

• Convenience Sample

Administrators of the fire department are concerned about the possibility of implementing a new property tax to raise money needed to replace old equipment. They decide to check public opinion by randomly selecting ten residents from each housing category (single family homes, apartments, condominiums, temporary housing, and retail property). What sampling method did they use?

• Simple Random Sample

• Stratified Random Sample

• Systematic Random Sample

• Cluster Sample

Fire department administrators decide to check public opinion on implementing a new property tax by having each firefighter survey 10 of his/her neighbors. What is wrong with this method?

• Undercoverage Bias

• Nonresponse Bias

• Response Bias

• Voluntary Response Sample

• Convenience Sample

The City Council decides to conduct a telephone poll. Pollsters ask a carefully chosen random sample of adults the following question: "Do you favor the construction of a new prison to deal with the high level of violent crime in our State?" Why might this plan be biased?

• Undercoverage Bias

• Nonresponse Bias

• Response Bias

• Voluntary Response Sample

• Convenience Sample

The City Council decides to conduct a telephone poll. Pollsters ask a carefully chosen random sample of adults the following question: "Do you favor the construction of a new prison to deal with the high level of violent crime in our State?" Do you think the proportion of "Yes" answers will underestimate, overestimate, or approximately reflect true public opinion?

• Underestimate

• Overestimate

• Approximately reflect true public opinion