In each oftne following cases, find the mean, variance, and standard deviation ofthe sampling distribution of the sample proportion 3?. la} p = .6, n = 257ir [Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values} Reference-5 lb]: ,0 = .5, n = 121 {Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values.) op-hat} (c) p = .9, n = 39? {Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values} mm}... .{ptm m... Id} ,0 = .91", n = 9?? [Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values} \"mm _ mm _ aw, _