Two polling organizations, Harris and Gallup, report weekly on the President's approval rating, which is expressed as a proportion of Americans who approve of the job the President is doing. In one particular week, each organization asks 100 randomly selected people this question. Their results are as follows:
Harris Poll: 0.57
Gallup Poll: 0.6
What are the mean and standard deviation of the sampling distribution of the difference of these organizations' results?
a. μ=0.015, σ=0,05
b. μ=0.015,σ=007
c. μ=0,03,σ=0,05
d. μ=0.03; σ= 0.07
e. μ= 0.03, σ= 0.06