Question: A supermarket chain just added two new stores located on opposite sides of a city. Management is interested in determining if customers are spending an equal time shopping in the stores. The research team temporarily installed a clock punch in each store and asked 100 customers at each location to collect a time card and punch in when they arrived and punch out as they left with their sacks full of groceries. Results from the time cards are summarized in the table below:

Test the hypothesis (at = 0.05 ) that the mean shopping time at Store 1 is more than the mean shopping time at Store 2.

1. What are the Null and Alternate Hypotheses?
2. Is it a hypothesis about one population or comparing two populations?
3. Is it a hypothesis concerning means or proportions?
4. Is it a Two-tail hypothesis or One-tail? Which tail?
5. Should we do a z-test or t-test? Why?
6. Conduct the 5-step hypothesis test procedure.
7. What decision would you make?

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