What are some differences between observational studies and experiments and what are some of the issues that may arise during data collection or interpretation? feel free to go beyond what I have asked.

The scatter plot graph shows the average annual income for a certain profession based on the number of years of experience which of the following is most likely to be the equation of the trend line for this set of data? a. i=5350e +37100 b. i=5350e-37100 c. i=5350e d. e=5350e+37100

Which of these is and example of a literal equation? a) 6+30=6^2 b)3x-4y c)12=9+3x d)ax-by=k

Which inequality has a dashed boundary line when graphed ?