An automobile manufacturer must decide whether to purchase B…
An automobile manufacturer must decide whether to purchase Brand F or Brand M tires for a new car model. To help arrive at a decision, an experiment was conducted using twelve tires of each brand (nF = nM = 12). The tires were tested until tread depth reached 2/32 inches. The average and standard deviation of tire life (in miles) were calculated for both samples. Assume that tire life is approximately normally distributed. Which statistical test should be used to determine whether the two brands have the same mean tire life?
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