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A local bank claims that the waiting time for its customers to be served is the...

A local bank claims that the waiting time for its customers to be served is the lowest in the area. A competitor

bank checks the waiting times at both banks. The sample statistics are listed below.

a) Construct a 95% confidence interval for the difference of means. (NEED UPPER AND LOWER BOUND!!!!!!!)

b)Use alpha=0.05 to test the local bank's claim.

Local Bank:

n1=45

xbar1=5.3 minutes

s1=1.1 minutes

Competitor Bank:

n2=50

xbar2=5.6 minutes

s2=1.0 minute

math   Statistics-And-Probability   
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