Question 1 of 13
Types of Variables
In an experiment investigating the impact of caffeine on BHHS teachers who are writing reports, it is found that the teachers who imbibe no caffeine write fewer reports than those who do.
It is later discovered, however, that the teachers who had drunk no coffee had drunk several glasses of wine each evening.
•The of this experiment could be: The teachers who ingest caffeine will write more reports in a given time period than those who don't.
•The is caffeine (present or absent).
•The is the number of reports written.
•A (amongst presumably many others!) could be the wine drinking of the control group, whose performance might be impaired by being tipsy (or whose reports might be far too uninhibited ever to be published).