First, I have a few questions from the article, "Family Dinners May Help Kids Cope With Cyberbullying" by Kathryn Doyle(https://tinyurl.com/yx8ffkvb. Kathryn Doyle summarizes research that can be found here: http://bit.ly/1unF9Ei)

1. What are the explanatory and the response variables in this study?
2. is the study an observational study or an experiment?
3. What are the two lurking variables that might prevent one from reaching a causal conclusion from the associations described in this study?
4. What are the two problems besides the presence of lurking variables that would prevent one from reaching a causal conclusion based on the study.
5. This is the abstract of the paper --> http://bit.ly/1unF9Ei. Do the authors make a causal claim in the paper? What is the quote the relevant language in the abstract that is helpful to solve all these questions?

The second question is,

Alex just joined an army unit with 6 other soldiers. The soldiers in his unit have the following number of years of service: 2, 6, 4, 1, 11, 1, 2.

1. What is the five-number summary for the years of service?
2. Is the distribution of the number of years of service left-skewed, right-skewed, or symmetric? How can you tell?
3. How can I draw a boxplot for the values in this sample?