The table lists the life (in months) of service before failure of a color television circuit board for 8 television sets manufactured by firm A and 10 sets manufactured by firm B. Use the Wilcoxon rank sum test to analyze the data, and test to see whether the life of service before failure of the circuit boards differs for the circuit boards produced by the two manufacturers.

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Life of Circuit Board (months) Firm 32 25 40 36 41 39 29 31 35 34 47 45 37 39 43 48 44 33