Following are the current prices and last year’s prices of a gallon of regular gas at a sample of 14 gas stations. Can you conclude that the median price is different now from what it was a year ago? Use the α = 0.01 level of significance.

a. Compute the value of the test statistic.

b. Find the critical value.

c. State a conclusion.

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12 3 4 5 6 7 8 9 10 11 12 13 14 Current 3.85 3.88 3.81 3.58 3.48 3.55 3.59 3.80 4.11 3.51 3.86 3.93 3.64 3.54 Last year 3.90 3.79 3.73 3.55 3.42 3.54 3.62 3.78 3.99 3.52 3.85 3.93 3.68 3.50