True mean lifespan-product is less claimed average lifespan

Reference no: EM13140294

A tire manufacturer claims his best product has an average lifespan of exactly 14 years. A skeptical product evaluator asks for evidence (data) that might be used to evaluate this claim. The product evaluator was provided data collected from a random sample of 50 people who used the product. Using the data, an average product lifespan of 13 years and a standard deviation of 2 years was calculated. Does the data indicate, at the significance level 0.05, that true mean lifespan of the product is less than that of the claimed average lifespan? Select the [Alternative Hypothesis, Value of the Test Statistic].

Reference no: EM13140294

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