AP Statistics › How to define experimental units
When designing an experiment, what is the purpose of blocking?
To separate a particular sample into groups previously known to be similar in some way that are expected to affect response to treatments
To increase the number of experimental units
To use chance to randomly assign experimental units to treatment groups (or vice versa)
To hold an extraneous variable constant
None of the other answers
Of the following examples, which best describes quantitative data?
Temperature measurements of water in degrees Fahrenheit.
A student's least favorite sport.
College grade level-freshman, sophomore, junior, or senior.
A child's gender.
The softness of a chair.
Which of the following is an example of qualitative data?
The gender of a high school student
The speed at which a car is traveling
The temperature of a glass of water
The amount of carbon monoxide emissions in the air
The average SAT score of students at a particular high school