Construct a 95% confidence interval for the difference

Construct a 95% confidence interval for the difference, ρ1 − ρ2, in each of the following situations:

1. n1 = 400,ρˆ1 = 0.65,n2 = 400,ρˆ2 = 0.58

Answer:

b. n1 = 180,ρˆ1 = 0.31,n2 = 250,ρˆ2 = 0.25

c. n1 = 100,ρˆ1 = 0.46,n2 = 120,ρˆ2 = 0.61