9.17/10 polnts awarded Scored In each of the following cases, find the mean, variance, and standard deviation of the sampling distribution of the sample proportion (a) p 7, n = 250 (Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values.) 0.7 e p(p-hat) = p 0.000340 e 01290 e (p-hat) (b) p _ 2, n 112 (Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values.) 029 p(p-hat) = p 01014299 (p-hat) 395 (Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values.) p(p-hat) = p 0.000405 e 01201 e (p-hat) (d)p .95, n = 1,036 (Round variance to 6 decimal places and standard deviation to 4 decimal places. Do not round intermediate values.)