Paper, Order, or Assignment Requirements

There are 2 questions here. Please do not combine the answers. Question 1 needs its own answer and Question 2 needs its own answer. Each answer needs its own source (peer reviewed article). Each answer is approximately 300 words EACH. Thank you and please let me know if you have any questions.
Question 1:
Write a research problem that would be best studied using a probability sample.
Discuss why this research problem is best studied using a probability sample, and what type of probability sample you would likely use.
Write a different research problem that would be best studied using a non-probability sample.
Discuss why this research problem is best studied using a non-probability sample, and what type of non-probability sample you would likely use.
Choose one of the above research problems, and find a peer-reviewed journal article related to that research problem.
Discuss the sampling strategy/process used in the article. What details are included, and what information regarding the sampling was ignored?
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Question 2

Please find a peer-reviewed social science article that uses an experimental group and a control group. Using the article, complete these steps:

Summarize the article.
Name the type of design used in the research
Describe whether the researcher(s) could have arrived at the same conclusion(s) without a control group, and
Discuss whether another design would have been more appropriate for the research and if so, what design and why?