Sampling & Experiments

This is the group of people to which the findings of the study are expected to be generalized.

• sample

• population

• experimental group

• researchers

Identify the Population:

Hartford County Public Schools randomly selected 230 teachers to find out which technology resource it's teachers feel is the most effective.

• 230 Teachers

• All Hartford County Teachers

• Students

• Public Schools in Hartford County

A quantity calculated from the observations in a SAMPLE.

• Parameter
• Study
• Statistic
• Observation

A numerical characteristic of the POPULATION

• Statistic
• Parameter
• Observation
• Study

A television station is interested in predicting whether voters in its viewing area are in favor of federal funding for abortions. It asks its viewers to phone in and indicate whether they support/are in favor of or are opposed to this. Of the 2241 viewers who phoned in, 1574 (70.24%) were opposed to federal funding for abortions.
This method of sampling likely suffered from...

• undercoverage
• voluntary response bias
• response bias
• non-response bias

The CCSU Student Union wants to know what type of events students are interested in so they decide to get a sample of undergraduate students. Which of the following would be the least useful variable to stratify by?

• major

• whether or not a student lives on or off campus

• grade level

• whether or not they drink coffee

Dylan wants to know how the students at his school rate the cafeteria.  He surveyed his school's basketball team to rate the school cafeteria. Is this a biased sample of the school's population?

• Yes, because it is a convenience survey
• No, the basketball team has the smartest students
• Yes, because it's voluntary survey
• No, he should have asked the football team

Source of bias that occurs when an individual chosen for the sample CAN'T be contacted or refuses to cooperate.

• Response Bias
• Undercoverage
• Nonresponse
• Voluntary Response

The process of gathering information/data from EACH member of the population.

• Census
• Interview
• Survey
• Questionnaire

Which sampling technique keeps the same proportions in the sample as in the population?

• stratified

• opportunity

• random

• self-selected