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For which one of the following situations would a Wilcoxon rank-sum (or Mann-Whitney) test be appropriate?

(a) Comparing the ratings of a new telephone set on a 5-point Likert scale by a panel of students with their ratings of a competitor’s product on the same scale.

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(b) Comparing the taste of a new ice cream product (rated from 1 to 10) as judged by a panel of teenage tasters and a panel of adult tasters.

(c) Judging whether the local internet service slows down during the day or at night.

(d) Estimating the correlation between the price of beach front homes and their age, in a neighbourhood known to have expensive homes.

(e) Estimating the correlation between the price of a wine bottle and its age, knowing that some of them were bottled more than 50 years ago.

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