The owner of a tea shop chain has stores in both Robina and Pacific Fair shopping centres. The manager of each store claims that they sell more tea. To test the managers' claims, the owner has randomly selected 10 days and then counted the number of cups of tea that each shop sells on those 10 days. The resulting data is provided in tea.csv. Previous statistical analysis has shown that the number of cups of tea sold is normally distributed.

a) Is there a difference between the average tea sales at each store (use ??? = 10%)? Show all steps, including clearly stating the hypotheses, any assumptions, calculations, conclusion, reasoning and final answer in a sentence.

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