solved Textbook: Business Research Methods Schindler, 14thTextbook: After reading Chapters 6,

Textbook:
Business Research Methods Schindler, 14thTextbook:
After reading Chapters 6, 7 and 8 Answer the following questions:
1.Compare the advantages and disadvantages of the observation to the communication approach. Under which circumstances could you make a case for using observation?
2.Distinguish between the following: 
a) Internal validity and external validity. 
b) Preexperimental design and quasi-experimental design. 
c) History and maturation. 
d) Random sampling, randomization, and matching. _________________________________________________________________________________________________
Answer the questions in APA style.
Minimum 300 words