At each data collection point in a trend survey, a researcher ...

[K@]

At each data collection point in a trend survey, a researcher
 
  a. studies a different sample from the same general population.
  b. studies a different sample from the same specific population.
  c. studies the same sample of individuals.
  d. studies a subset of a population at a specific point in time.

Question 2

As an example of mastery of formal operations, a teacher might ask students to
 
  a. name all fifty states.
  b. write an adventure story in which they play the role of the main character.
  c. calculate the area of a triangle.
  d. list the advantages and disadvantages of the use of plastic products.

[KKcool]

Answer to Question 1

A

Answer to Question 2

b

[K@]

Thanks for the timely response, appreciate it

[atrochim]

Excellent