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An advertisement for Jewel, a supermarket chain in Chicago, claims that Jewel has had consistently lower prices than Dominic. As part of a survey conducted by an "independent market basket pricechecking company", the average weekly total, based on the prices of approximately 95 items, is given for two different supermarket chains recorded during 4 consecutive weeks in a particular month.

Week     Jewel       Dominic
1           264.40      266.17
2           250.76      265.79
3           242.04      265.26
4           244.27      271.32

Is there a significant difference in the average prices for these two different supermarket chains? Test at α = 0.05

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Category:- Statistics and Probability
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