During the course of a very large study spanning several years, ...

[humphriesbr@me.com]

During the course of a very large study spanning several years, the same research assistant conducts all measurements of the dependent variable.
 
  During his first year, he used a structured assessment, but as he became more familiar with the study, he no longer used the structured measure. The investigator of this project should be concerned with
   a) instrumentation
 b) history.
 c) maturation.
 d) testing.

Question 2

A Transportation Security Authority worker examines x-rays of the contents of travelers' luggage, looking for weapons or other forbidden items. This worker's duties are an example of which of the following?
 
  a) A vigilance tas
 b) An orientation task
 c) A priming task
 d) A spotlight task

[Missbam101]

Answer to Question 1

A

Answer to Question 2

A

[humphriesbr@me.com]

Gracias!

[daiying98]

Excellent