It has been hypothesized that individuals suffering from Alzheimer’s Disease may spend less time per night in the deeper stages of sleep. A sample of 71 Alzheimer’s patients was tested to assess the amount of time (in minutes) in stage IV sleep. The sample produced a mean of 46 minutes, with a standard deviation of 14 minutes of IV sleep over a 24 hour period of time.
What is the lower bound of the 95% confidence interval?
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