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Question 7
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An electricity provider wants to estimate the mean time it takes for customers to get an electrical fault resolved. The provider took a random sample of 36 customers who had recently reported an electrical fault and found a mean time of 16.6 hours. Assume the population standard deviation is 0.47 hours. What is the value of the margin of error for a 95% confidence interval? Please give your answer correctly rounded to two decimal places and do NOT give units.
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