Methods and Measurements Flashcards
1
Q
What is random error?
A
present in all types of measurements and shifts measurements in unpredictable ways
2
Q
What is precision?
A
measure of how closely individual measurements of the same value agree with each other
3
Q
What is systematic error?
A
shifts all measurements in a standardized way
4
Q
What are experimental studies?
A
scientists manipulate one or more variables in order to observe the outcome
5
Q
What are observational studies?
A
scientists observe variables without manipulating them
6
Q
What are positive controls?
A
groups in which an effect is expected because scientists manipulate them in a way that is already known to produce an effect
7
Q
What are negative controls?
A
groups in which no effect is expected
