Mathematics, 21.02.2020 17:48, gottapass62

Bright Bulb light bulb company is planning a study to assess the average life expectancy of their light bulbs. They know the standard deviation is σ = 400 hours. They want a 95% confidence interval with a margin of error of 50 hours. What sample size do they need?

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Bright Bulb light bulb company is planning a study to assess the average life expectancy of their li...