SWBAT: Explain how undercoverage, nonresponse, and question wording can lead to bias in a sample survey. Do Now: An airline that wants to assess customer satisfaction chooses a random sample of 10 of its flights during a single month and asks all of the passengers on those flights to fill out a survey. This is an example of a (a) multistage sample. (b) stratified sample. (c) cluster sample. (d) simple random sample. (e) convenience sample.

Inference for Sampling SWBAT: Explain how undercoverage, nonresponse, and question wording can lead to bias in a sample survey. Inference for Sampling The process of drawing conclusions about a population on the basis of sample data. Margin of Error Results from random samples come with a margin of error that sets bounds on the size of the likely error. Larger random samples generally have smaller errors than smaller samples.

Response bias is a systemic pattern of incorrect responses. SWBAT: Explain how undercoverage, nonresponse, and question wording can lead to bias in a sample survey. Sampling Pitfalls Undercoverage occurs when some groups in the population are left out of the process of choosing the sample. Nonresponse occurs when an individual can’t be contacted or refuses to participate. Response bias is a systemic pattern of incorrect responses. The wording of questions is the most important influence on the answers given to a sample survey.

SWBAT: Explain how undercoverage, nonresponse, and question wording can lead to bias in a sample survey.

SWBAT: Explain how undercoverage, nonresponse, and question wording can lead to bias in a sample survey.

SWBAT: Explain how undercoverage, nonresponse, and question wording can lead to bias in a sample survey.

SWBAT: Explain how undercoverage, nonresponse, and question wording can lead to bias in a sample survey.