$(1)$ When interviewing senior adults with disability $($age $65+)$ in Columbia SC$,$ I plan to ask this following question: "Have you taken paratransit service?" Suppose research in other states suggests that about $75\%$ of senior adults with disabilities claim to have used paratransit service. For this study, set your confidence level of $95\%.$ Also, suppose there are about $50,000$ senior adults with disability in Columbia SC$.$ What is the sample sized needed to understand the share of paratransit use in senior adults with disability in Columbia SC$?$ Reporting sample size with margin of error for $+-1,3,5\%.$