An ammunition producer claims his best product has an average lifespan of exactly 18 years. A...
An ammunition producer claims his best product has an average lifespan of exactly 18 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 15 years and a standard deviation of 8 years was calculated. Select the 90%, confidence interval for the true mean lifespan of this product.
a) [14.736, 15.264] b) [-1.8667, 1.8667] c) [13.133, 16.867] d) [16.133, 19.867] e) [11.606, 18.394] f) None of the above
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An ammunition producer claims his best product has an average
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Thank you
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