An electronic manufacturer produces lampshades with a life span of approximately normally distributed with a standard deviation of 35 hours. a. If a sample of 50 bulbs has an average life span of 835 hours, construct 95% confidence interval for the average life span of all the lampshades produced. Interpret the result. b. What must be the sample size if the manufacturer wishes to be 99% confident that the estimate is within 10 hours of the correct mean? Interpret the result.

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