Chantal is interested in how the attitudes of children change ...

[abc]

Chantal is interested in how the attitudes of children change over time. She intends to survey a
  single group of students once a year as the children progress through grade school. What type of
  study does she need to run?
 
  A) longitudinal research B) cross-sectional research
  C) single-strata approach D) sampling

Question 2

Gathering data from one stratum of the population of interest best describes
 
  A) longitudinal research B) cross-sectional research
  C) sampling D) single-strata approach

[Kedrick2014]

Answer to Question 1

A

Answer to Question 2

D

[abc]

Great answer, keep it coming

[kthug]

Thanks for the timely response, appreciate it