4-Suppose that sample results representative of the times for Delta Airlines and Northwest Airlines to locate flight information on their Internet web sites are as follows:
Delta: Northwest:
Sample Mean = 2.5 minutes Sample Mean = 2.1 minutes
Sample Standard Deviation = 0.8 minutes Sample Standard Deviation = 1.1 minutes
Sample Size = 22 Sample Size = 20
Please show calculation on paper. Thank you.
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