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Sherry is a bank manager and wants to improve the time customers spend on waiting in...

Sherry is a bank manager and wants to improve the time customers spend on waiting in the lobby for services. she has a large sample of 125 customers. the sample average waiting time (mean) is 11 minutes and s = 4 minutes. she wants to be able to claim that average waiting time is less then 12 minutes. plesse help her test with a=0.02 with this large sample.

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Step 4. Please tell me if Sherry is able to make the claim that she wants to make.
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