Use the given statistics to complete parts​ (a) and​ (b). Assume that the populations are normally distributed. ​(a) Test whether μ1>μ2 at the α=0.01 level of significance for the given sample data. ​(b) Construct a 99​% confidence interval about μ1−μ2.

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Use the given statistics to complete parts​ (a) and​ (b). Assume that the populations are normally distributed.
​(a) Test whether
μ1>μ2
at the
α=0.01
level of significance for the given sample data.
​(b) Construct a
99​%
confidence interval about
μ1−μ2.
 
 
Population 1
Population 2
 
n
21
18
x
45.8
43.5
s
5.7
11.8
 
 
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