There are 350 families in Brookstown. A poll of 50 families reveals that 20 of the 50 families sampled do charity regularly. (a) Construct the 95 percent confidence interval for the proportion of families doing charity regularly, without using the FPC (round to 3 decimal places): [ , ] (b) Construct the 95 percent condence interval for the proportion of families doing charity regularly, using the FPC (round to 3 decimal places): [ , ]