Math Quiz - Statistics
A pregnancy study in Chicago, randomly selected 25 communities from the metropolitan area, then interviewed all pregnant women in these communities.
cluster
A researcher for an airline interviews all of the passengers on five randomly selected fights.
cluster
All of the teachers from 85 randomly selected nation's middle schools were interviewed.
cluster
A community college student interviews the first 100 students to enter the building to determine the percentage of students that own a car.
convenience
To avoid working late, the quality control manager inspects the last 10 items produced that day.
convenience
A market researcher randomly selects 200 drivers under 35 years of age and 100 drivers over 35 years of age.
stratified
Based on 12,500 responses from 42,000 surveys sent to its alumni, a major university estimated that the annual salary of its alumni was 92,500.
voluntary
At a local community College, five math classes are randomly selected out of 20 and all of the students from each class are interviewed.
cluster
Calling randomly generated telephone numbers, a study asked 855 US adults which medical conditions could be prevented by their diet.
simple random
The name of 70 contestants are written on 70 cards, the cards are placed in a bag, and three names are picked from the bag.
simple random
32 sophomores, 35 juniors, and 49 seniors are randomly selected from 230 sophomores, 280 juniors, and 577 seniors at a certain high school.
stratified
A researcher randomly selects and interviews fifty male and fifty female teachers.
stratified
Every fifth person boarding a plane is searched thoroughly.
systematic
To ensure customer satisfaction, every 35th phone call received by customer service will be monitored.
systematic
