The number of television sets produced from an assembly line each day is known to have a standard deviation of 17.4 sets per day. The production line averaged 452.3 sets per day for 20 randomly selected days. Which of the following represents a 95% confidence interval for the population mean number of sets per hour?     452.3 ± 9.4     452.3  11.3     452.3 ± 13.8     452.3 ± 7.63

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The number of television sets produced from an assembly line each day is known to have a standard deviation of 17.4 sets per day. The production line averaged 452.3 sets per day for 20 randomly selected days. Which of the following represents a 95% confidence interval for the population mean number of sets per hour?

   

452.3 ± 9.4

   

452.3  11.3

   

452.3 ± 13.8

   

452.3 ± 7.63

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