American attitudes toward big business change over time and probably are cyclical. Suppose the following data represent a survey of 20 American adults taken in 1993 and again in 2019 in which each adult was asked to rate American big business overall on a scale from 1 to 100 in terms of positive opinion. A response of 1 indicates a low opinion and a response of 100 indicates a high opinion. Use a Wilcoxon matched-pairs signed rank test to determine whether the scores from 2019 are significantly higher than the scores from 1993. Use α = .10. Assume the underlying distributions are symmetrical.

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Person 1993 2019 Person 1993 2019 1 11 58 2 3 4 5 6 7 8 9 10 49 54 38 27 39 75 59 53 67 68 22 61 58 60 38 80 仓 72 62 12 57 13 49 63 14 48 49 15 19 39 16 32 34 17 60 66 43 67 18 80 73 19 55 20 55 68 90 57 58