1. A UK charity is interested in studying the long-term effects of breastfeeding on intelligence and income. 5000 mothers participated in the study and provided data on breastfeeding duration. The cohort of children is now 30 years old and the charity is ready to collect the second round of data and conduct a regression analysis. a) Explain how the recruitment process should have been conducted to avoid common pitfalls resulting in a biased sample. b) Explain why a bivariate regression analysis is not useful in proving the effects of breastfeeding. c) If you were put in charge of the second round of data collection, what additional data would you collect to conduct an objective test of the long-term benefits of breastfeeding?