A shoemaker claims his best product has an average lifespan of exactly 14 years. A skeptical customer asks for evidence (data) that might be used to evaluate this claim. The customer was provided data collected from a random sample of 45 people who used the product. Using the data, an average product lifespan of 15 years and a standard deviation of 6 years was calculated. Select the 95%, confidence interval for the true mean lifespan of this product.   a) [14.739, 15.261] b) [13.247, 16.753] c) [12.317, 17.683] d) [12.247, 15.753] e) [-1.7531, 1.7531] f) None of the above

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