(Answered) Please explain how to obtain the folllowingthe following

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Please explain how to obtain the folllowing:

The following information is obtained from two independent samples selected from two normally distributed populations.

n1=18¯x1=7.82σ1=2.35n2=15¯x2=5.99σ2=3.17n1=18x¯1=7.82σ1=2.35n2=15x¯2=5.99σ2=3.17

What is the point estimate of μ1-μ2μ1-μ2?
Construct a 99% confidence interval for μ1-μ2μ1-μ2. Find the margin of error for this estimate.

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