Suppose you wish to determine whether there are differences in the average prices among 3 major supermarkets. You randomly select 8 regularly bought items, each distinct item of the same brand, and observe their unit prices at each supermarket. The following data were obtained: Is there a need to block the items? Why? What other aspects could be considered that may influence the prices that are being recorded?

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Suppose you wish to determine whether there are differences in the average prices among 3 major supermarkets. You randomly select 8 regularly bought items, each distinct item of the same brand, and observe their unit prices at each supermarket. The following data were obtained:

Is there a need to block the items? Why?
What other aspects could be considered that may influence the prices that are being recorded?

 

Supermarket
A
В
Item
1
2.84
2.90
2.82
2
0.51
0.56
0.51
3
1.08
1.10
1.08
4
3.75
3.80
3.70
5
0.77
0.75
0.77
6.
1.59
1.54
1.63
7
0.82
0.77
0.77
8.
0.65
0.68
0.59
Transcribed Image Text:Supermarket A В Item 1 2.84 2.90 2.82 2 0.51 0.56 0.51 3 1.08 1.10 1.08 4 3.75 3.80 3.70 5 0.77 0.75 0.77 6. 1.59 1.54 1.63 7 0.82 0.77 0.77 8. 0.65 0.68 0.59
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