Confidence interval for ud the mean

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A large accounting firm tests a new software with 10 randomly selected employees. It measures the time that the employees take in finishing a particular type of task with the existing software in use and then measures the time that they take with the new software. They compute the difference d=(new - old) for each of these 10 employees to be able to estimate . Ud. In the comparison, they find that the mean of these differences is 67 minutes and standard deviation 12 minutes. Construct a 95% confidence interval for Ud the mean of such differences for the entire population of their employees. Assume a normal population.

Reference no: EM132438613

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