2. In a survey of 25 company management staff taken as a sample. They found that they worked 5 hours a day on average, with a standard deviation of 1.5 hours. Make an interval estimate with a 95% confidence level of the average daily working hours of the company management staff in the survey area. Assume that the population distribution of hours worked follows a normal distribution.

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Let x be the sample mean be the sample standard deviation n be the sample size is the popula... View the full answer