Cornwall and Hudson, a large retail department store, wants to handle just one brand of MP3 player. The list has been narrowed to two brands: Sony and Panasonic. To help make a decision, a panel of 16 audio experts met. A music track using the Sony player was played. Then the same track was played using the Panasonic player. A “+” in the following table indicates an individual’s preference for the Sony player, a “−” indicates preference for the Panasonic player, and a 0 signifies no preference. Expert 1  2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 + − + − + + − 0 − +   −   +   +   −  +   − Conduct a test of hypothesis at the .10 significance level to determine whether there is a difference in preference between the two brands.

Question

Cornwall and Hudson, a large retail department store, wants to handle just one brand of MP3 player. The list has been narrowed to two brands: Sony and Panasonic. To help make a decision, a panel of 16 audio experts met. A music track using the Sony player was played. Then the same track was played using the Panasonic player. A “+” in the following table indicates an individual’s preference for the Sony player, a “−” indicates preference for the Panasonic player, and a 0 signifies no preference.

Expert

1  2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

+ − + − + + − 0 − +   −   +   +   −  +   −

Conduct a test of hypothesis at the .10 significance level to determine whether there is a difference in preference between the two brands.

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Hypothesis Testing

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