Sampling Techniques
A study on attitudes about smoking is conducted at a college. The students are divided by class (Freshman, Sophomore, Junior, Senior). Then a random sample is selected from each class and interviewed. What sampling technique is this?
Stratified Random Sample
A list of individuals from whom the sample is drawn.
Sampling Frame
Law enforcement officials use a radar gun to measure the speed of random vehicles on an interstate. What sampling technique is this?
Random Sample
If we wish to compare the average PSAT scores of boys and girls taking AP Statistics at this high school, which would be the best way to gather these data?
Census
For quality assurance, every tenth machine part is selected from an assembly line and measured for accuracy. What sampling technique is this?
Systematic Sample
In an experiment, the primary purpose of blocking is to reduce...
Variation
After a hurricane, a disaster area is divided into 200 equal grids. 30 of the grids are selected and every occupied household in the grid is interviewed to help focus relief efforts on what residents require most. What is the sampling technique?
Cluster Sample
Related to the measurement of an amount or size of something.
Quantitative
A researcher polls people as they walk by on the street. The location and time of day and other factors may produce a biased sample of people.
Convenience Sample
Asking random people instead of a specific group will result in this type of sample.
Representative sample