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Mathematics, 12.11.2020 18:50 zainababbas25
In a sample of 80 light bulbs, the mean lifetime was 1217 hours with a standard deviation of 52 hours. a. Find the 95% confidence interval for the mean lifetime of this type of bulb. Justify the reason you chose the distribution used to construct the confidence interval. b. How many light bulbs must be sampled so that a 95% confidence interval will specify the mean lifetime to within + 8 hours?
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In a sample of 80 light bulbs, the mean lifetime was 1217 hours with a standard deviation of 52 hour...
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