The following information is obtained from two independent samples selected from two normally distributed populations.
n1 = 18 x1 = 7.82 σ1 = 2.35
n2 =15 x2 =5.99 σ2 =3.17
A. What is the point estimate of μ1 - μ2? Round to two decimal places.
B. Construct a 99% confidence interval for μ1 - μ2. Find the margin of error for this estimate. Round to two decimal places.