1) Bias is present in each of the following cases

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1) Bias is present in each of the following cases. Identify the source of the bias and specify the direction of the bias (that is, whether the sample result will be systematically above or below the true population result.)

1. A flour company wants to know what fraction of Minneapolis households bakes their own bread. An SRS of 500 residential addresses is drawn and interviewers are sent to these addresses. The interviewers are employed during the regular working hours on weekdays and they interview only during those hours.
2. The Miami Police Department wants to know if black residents of Miami are satisfied with police service in their neighborhood. A questionnaire is prepared. An SRS of 300 mailing addresses in predominantly black neighborhood is chosen, and a uniformed officer is sent to each address to interview an adult resident.

2. Comment on each of the following as a potential sample survey question. Is the question clear? Is it slanted toward a desired response?

1. “Does your family use food stamps?”
2. “Which of the flowing best represents your opinion on gun control?”

 

1. The government should confiscate our guns.

 

2. We have the right to keep and bear arms.

 

3.  “A freeze in nuclear weapons should be favored because it would begin a much-needed process to stop everyone in the world from building nuclear war in the future. Do you agree or disagree
4. “In view of escalating environment degradation and incipient resource depletion, would you favor economic incentives for recycling resource- intensive consumer goods?”