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.) pip-hat) =p op hat) op het eviation to 4 decimal places. Do not round intermediate (b) p 3, n-113 (Round variance to 6 decimal places and standard values.) iphat) =p alpha2 op har (c) p= .6. n = 410 (Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values.) uip-hat) =p ophat) gp hat) (d) p=98, n = 970 (Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values.) ipha=p olphat olphat)