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Mathematics, 19.11.2019 03:31 jaliyahmw

Atoy maker claims his best product has an average lifespan of exactly 14 years. a skeptical quality control specialist asks for evidence (data) that might be used to evaluate this claim. the quality control specialist was provided data collected from a random sample of 45 people who used the product. using the data, an average product lifespan of 19 years and a standard deviation of 4 years was calculated. select the 99%, confidence interval for the true mean lifespan of this product.

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