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QUESTION
A company has developed a new type of lightbulb and wants to estimate its mean lifetime. A simple random sample of 101 bulbs had a mean lifetime of...
A company has developed a new type of lightbulb and wants to estimate its mean lifetime. A simple random sample of 101 bulbs had a mean lifetime of 750.2 hours with a standard deviation of 30 hours. A 95% confidence interval for the population mean lifetime is ______ (round to three decimal places)
