A study was conducted to compare the selling prices of the two leading convenient stores in Hong Kong, namely KO and 11-7. Ten items were randomly selected from the stores and the prices of the selected items for each convenient store were recorded and tabulated below.

Item 1 2 3 4 5 6 7 8 9 10

KO 41.1 43.5 6.7 47.3 60.2 14.0 34.1 22.8 13.5 39.4

11-7 43.6 48.7 10.4 52.7 60.6 19.0 28.7 24.7 14.5 46.1

Do the data given in the table provide sufficient evidence to indicate that selling price of the items in KO convenient store is, on the average, cheaper than that in 11-7 convenient store? Carry out an appropriate test using = 0.05. State your conclusion clearly.