Sampling Methods Stats

Identify the sampling method:

A market researcher randomly selects 200 drivers under 35 years of age and 100 drivers over 35 years of age.

• Systematic

• Cluster

• Stratified

• Convenience

• Voluntary Response

Identify the sampling method:

32 sophomores, 35 juniors and 49 seniors are randomly selected from 230 sophomores, 280 juniors, 577 seniors at a certain high school.

• Systematic

• Cluster

• Convenience

• SRS

• Stratified

To ensure customer satisfaction, every 35th phone call received by customer service will be monitored.

• Systematic

• Cluster

• Convenience

• SRS

• Stratified

Identify the sampling method:

Calling randomly generated telephone numbers, a study asked 855 U.S. adults which medical conditions could be prevented by their diet.

• Voluntary Response

• Cluster

• Convenience

• SRS

• Stratified

Identify the sampling method:

A researcher randomly selects and interviews fifty male and fifty female teachers.

• SRS

• Cluster

• Stratified

• Convenience

• Systematic

To avoid working late, the quality control manager inspects the last 10 items produced that day.

• Systematic

• Cluster

• Convenience

• SRS

• Voluntary Response

Is this sample representative? Explain.

To determine the percentage of teenage girls with long hair, Teen magazine published a mail-in questionnaire. Of the 500 respondents, 85% had hair shoulder length or longer (USA Today, July 1, 1985).

• Yes; only teenagers who read Teen could respond. This does represent all teens.

• Yes; all teens had the opportunity to respond.

• No; only teenagers who read Teen could respond. This does not represent all teens.

• No; all teens had the opportunity to respond.

Darren measures the heart rate of 10 randomly selected students in his Algebra 2 class. What is the population? What is the sample?

• The Algebra 2 class is the population and the 10 randomly selected students are the sample.

• The Algebra 2 class is the population and the high school is the sample.

• The Algebra 2 class is the sample and the 10 randomly selected students are the population.

• The high school is the population and the Algebra 2 class is the sample.

A school newspaper publishes an article stating that approximately 40% of students in the school listen to classical music when studying. The newspaper explains that the poll was given to students in a randomly selected music club, where 5 of the 12 students said they listen to classical music while studying.

Which statement is true?

• The findings in the article represent the entire population because the newspaper randomly selected the club for the poll.

• The findings in the article represent the entire population because approximately 40% of the students polled listen to classical music.

• The findings in the article do not represent the entire population because the club is not representative of the student population.

• The findings in the article do not represent the entire population because less than 40% of students listen to classical music.

A large high school’s athletic director wants to find out students’ opinions on several matters by surveying a random sample of the student population. Resources will allow 60 of the school’s 2,000 students to be surveyed.

Which method of choosing the student sample would allow the athletic director to draw the most valid conclusions based on survey results?

• surveying the first 15 students who arrive at school each morning for four mornings in a row during the week

• surveying the first 60 students who respond to a flyer requesting that students participate in a survey in exchange for $1

• surveying 15 male students from each grade whose numbers are drawn in a lottery in which all members of that grade are given a number and entered

• surveying 60 students whose numbers are drawn in a lottery in which all 2,000 students from the school are given a number and entered