[1) Data were collected by asking people who participate in a needle exchange program (NEP) to answer questions about themselves, including recalling previous police encounters. How might this approach to data collection affect the validity of the data in this study? (2) The investigators collected data from two different NEPs, one in Southwest Baltimore and one in West Baltimore. Besides providing more data, provide a reason why having both NEPs in the study was better than only having one of them. (3) Based upon the information in Table 1, is race (white versus non-white) associated with any other respondent characteristics? Provide evidence for your answer. [4) Based upon the information in Table 2, is race associated with the number of times being arrested or cited while near a NEP? Provide evidence for your answer. (5) Write out the tted regression model for Model 1 presented in Table 1. Provide an interpretation for the value 5.020. (6) Based upon Model 1 presented in Table 1, if we have two individuals, one who is 20 years old and one who is 30 years old, and they are identical with respect to all other characteristics, what is the expected difference in the number of police stops near NEPs that they experience? (7) Age, gender and NEP visits all have pvalues less than 0.05 in Model 1 in Table 3. Based upon your answers to questions (3) and (4), can we determine if the average number of police stops near NEPs is related more a person's race, or to person's age and gender? (8) You do prefer Model 1 or Model 2 presented in Table 2? Provide evidence for your