A newspaper editor wants to investigate whether the residents if+two+countries+support+the+propos al+to+build+s+wind+farm.+she+plans+ to+take+an+srs+of+30+residents+from +the+southern+county+and+40+residen ts+from+the+northern+county,+then+l ook+at+the+difference+between+the+p roportions+of+residents+that+suppor t+each+sample.+suppose+that+65%25+o f+the+residents+of+the+southern county and 52%, 25 of the residents of the northern county approve. What are the mean and standard deviation of the sampling distribution of the difference in sample proportion