A shopper wanted to test whether there was a difference in the average waiting times at the check-ou

A shopper wanted to test whether there was a difference in the average waiting times at the check-out counter among 5 different supermarkets. She selected a random sample of 20 shoppers from each of the five supermarkets. What is the null hypothesis for this situation?
A) The average waiting time to check out is 25 minutes for all five supermarkets.
B) The average waiting time to check out is the same for all five supermarkets.
C) The average waiting time for each of the 100 shoppers is different.
D) The average waiting time to check out is not the same for all five supermarkets

 

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