## Step 5: Formulate conclusions

(t) Write a few sentences recapping and summarizing your analysis for this research study, in particular:

- What did you learn about the relationship between Facebook friends and brain density measurements of the left middle temporal gyrus
*for this sample*from the scatterplot and the correlation coefficient about the sample data? - State the hypotheses that we were testing
*about the population*in words (*Hint*: Back in part e). - What are your final conclusions about the relationship between Facebook friends and brain density for the
*population*and how do they follow from your p-value? - What is your estimate of the population slope, make sure you include an interpretation of what we mean by 'slope' in this context?
- What population are you willing to generalize these results to? (briefly justify)
- Are you able to draw a cause-and-effect conclusion between Facebook friends and brain density in this population? (briefly justify)

## Step 6: Look back and ahead

(u) What concerns do you have about how these data were collected and how that might impact the conclusions you can draw form this study? (Your answer should discuss at least one potential non-sampling error.)