Can you help me solve a, b c and d

Calibri Light 20~ B I U V Av Ao EVEVE Ev 2. 400 Spokane County residents were asked if they thought the new SPS stadium should be built downtown. 242 said Yes and 158 said No. Use this data to answer each question. a. What proportion of your sample approves of the stadium being downtown? b. Determine the margin of error for your sample at the 90% confidence level. c. Interpret the results of your answers in (a) and (b). d. Determine the margin of error for this sample at the 99% confidence level