In each of the following cases, find the mean, variance, and standard deviation of the sampling distribution of the sample proportion . (a) p = .4, n = 241 (Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values.) = p 2 (b) p = .3, n = 113 (Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values.) = p 2 (c) p = .6, n = 410 (Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values.) = p 2 (d) p = .98, n = 970 (Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values.) = p 2