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(Solved): A bank claims that the mean waiting time in line is less than 4.3 minutes. A random sample of 20 c ...
A bank claims that the mean waiting time in line is less than 4.3 minutes. A random sample of 20 customers has a mean of 4.1 minutes with a standard deviation of 0.8 minute. If
\alpha =0.05, test the bank's claim. Assume the distribution is normal. Use the Confidence Interval method. Exact value of the standard deviation is not known.
(3.791,4.409)Reject claim
(4.025,4.290)Support claim
(3.506,4.571)Reject claim
(3.567,3.842)Support claim
