a regional manager implemens a policy change for stores in h

a regional manager implemens a policy change for stores in his region to begin greeting customers whenever they are standing within a 3 meter distance in the store. He compares mean daily purchase numbers over one month from pre-change to post-change for each store to see if the change makes a difference in sales.

Mean daily purchases for store 1 through store 10 before policy: 82, 103, 91, 91, 83, 76, 90, 114, 88, 92

Mean daily purchases for store 1 through store 10 after policy: 102, 83, 113, 87, 94, 78, 91, 117, 101, 107

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