• Explain how you can tell from both the correlation coefficient and a scatterplot the direction of a relationship.
• If a researcher found that there was a correlation of r = -0.67 between the number of siblings a person has and introversion, and the researcher sampled n = 30 people, what conclusions can you make about this relationship?
• Explain why correlation does not equal causation.
• Explain what the coefficient of determination is and how to interpret it.
• A researcher finds that the line of best fit for the relationship between hours of exercise a person does per week and their sleep quality (0-10 scale) is5 + 0.5x. What would you expect someone's sleep quality to be if they exercised for 8 hours this week?