A researcher wants to estimate p, the mean number of minutes before a person scores over 200 on a new computer game. She wishes to get estimates, separately, for each of the groups (a) novices, (b) occasional game players, and (c) expert game players. When using  to estimate p find the (i) standard error and the (ii) 100(1 - a)% error margin for each group.
(a) Novice, n = 125, σ = 65, 98% error margin
(b) Occasional n = 47, σ = 38, 95% error margin
(c) Expert, n = 6, σ = 20, 90% error margin